Gr12 Mathematics: Ch 7 Sum Euclidean Geometry
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Questions and Answers

What is the primary purpose of a ratio?

  • To provide the actual measurements of the quantities
  • To compare quantities with different units
  • To express how many times one quantity is contained in the other with the same units (correct)
  • To find the sum of the quantities

    • What is the result of cross-multiplication in proportion?

  • w / x = y / z
  • w - x = y - z
  • w • z = x • y (correct)
  • w + x = y + z

    • If two ratios are equal, what can be said about the quantities involved?

  • The quantities are equal
  • The quantities are proportional (correct)
  • The quantities have different units
  • The quantities cannot be compared

    • What is the theorem that states that if a line is drawn parallel to one side of a triangle, it divides the other two sides proportionally?

    <p>Thales' theorem</p> Signup and view all the answers

    What is the first step in solving proportional problems?

    <p>Identify the given ratios</p> Signup and view all the answers

    What is the property of proportion that states w/x = z/y?

    <p>Reciprocal Proportion</p> Signup and view all the answers

    Ratios are typically written in which form?

    <p>In various forms, such as a fraction, with a colon, or in words</p> Signup and view all the answers

    What do ratios not provide?

    <p>The actual measurements of the quantities</p> Signup and view all the answers

    What is the formula to find the area of a triangle?

    <p>Area = (1/2) × base × height</p> Signup and view all the answers

    A quadrilateral with all sides of equal length is known as a?

    <p>Square</p> Signup and view all the answers

    What is the formula to find the area of a parallelogram?

    <p>Area = base × height</p> Signup and view all the answers

    Which theorem states that if a line is drawn parallel to one side of a triangle, it divides the other two sides proportionally?

    <p>Basic Proportionality Theorem</p> Signup and view all the answers

    What is the formula to find the area of a trapezium?

    <p>Area = (1/2) × (base1 + base2) × height</p> Signup and view all the answers

    Which type of polygon has diagonals that bisect each other?

    <p>Rhombus</p> Signup and view all the answers

    What is the formula to find the area of a kite?

    <p>Area = (1/2) × diagonal1 × diagonal2</p> Signup and view all the answers

    Which theorem states that if two triangles are equiangular, then the corresponding sides are in proportion and the triangles are similar?

    <p>Triangle Proportionality Theorem</p> Signup and view all the answers

    What is the conclusion of the proportionality of triangles with the same height?

    <p>Triangles with equal heights have areas proportional to their bases.</p> Signup and view all the answers

    Which polygon has four right angles and all sides of equal length?

    <p>Square</p> Signup and view all the answers

    If ∆ABC and ∆DEF are similar triangles, what can be concluded about the ratios of their corresponding sides?

    <p>The ratios are equal and proportional</p> Signup and view all the answers

    In the proof of the theorem 'Triangles with Sides in Proportion are Similar', what is the purpose of drawing GH?

    <p>To show GH is parallel to BC</p> Signup and view all the answers

    What is the Pythagorean Theorem used to find?

    <p>The length of the hypotenuse of a right-angled triangle</p> Signup and view all the answers

    If ∆ABC and ∆DEF are equiangular triangles, what can be concluded about their corresponding sides?

    <p>They are proportional</p> Signup and view all the answers

    What is the condition for two triangles to be similar?

    <p>They are equiangular and have proportional corresponding sides</p> Signup and view all the answers

    In the proof of the theorem 'Triangles with Sides in Proportion are Similar', what is the purpose of the construction of AD?

    <p>To show AD is perpendicular to BC</p> Signup and view all the answers

    What is the formula for the area of a triangle?

    <p>Area = (1/2) × base × height</p> Signup and view all the answers

    If two triangles are similar, what can be concluded about their corresponding angles?

    <p>They are equal</p> Signup and view all the answers

    What is the statement of the Pythagorean Theorem?

    <p>AC^2 = AB^2 + BC^2</p> Signup and view all the answers

    If ∆ABC and ∆DEF are similar triangles, what can be concluded about their areas?

    <p>They are proportional</p> Signup and view all the answers

    What is the area of a triangle with a base of 6 units and a height of 8 units?

    <p>24 square units</p> Signup and view all the answers

    If two triangles have equal bases and are between the same parallel lines, what can be concluded about their areas?

    <p>They are equal in area</p> Signup and view all the answers

    What is the statement of the Proportion Theorem?

    <p>A line drawn parallel to one side of a triangle divides the other two sides proportionally</p> Signup and view all the answers

    What is the Mid-point Theorem?

    <p>The line joining the midpoints of two sides of a triangle is parallel to the third side and equal to half its length</p> Signup and view all the answers

    What are the conditions for similarity of two polygons?

    <p>All pairs of corresponding angles are equal and all pairs of corresponding sides are in the same proportion</p> Signup and view all the answers

    What is true about equiangular triangles?

    <p>They are similar</p> Signup and view all the answers

    What is the formula for the area of a triangle?

    <p>1/2 × base × height</p> Signup and view all the answers

    What can be concluded about two triangles if they have proportional corresponding sides?

    <p>They are similar</p> Signup and view all the answers

    What is the converse of the Mid-point Theorem?

    <p>The line drawn from the midpoint of one side of a triangle parallel to another side bisects the third side</p> Signup and view all the answers

    If two triangles are similar, what can be said about their corresponding sides?

    <p>They are in the same proportion</p> Signup and view all the answers

    What is the condition for two triangles to be similar?

    <p>All pairs of corresponding angles are equal and all pairs of corresponding sides are in the same proportion</p> Signup and view all the answers

    What is the formula for the area of a triangle?

    <p>Area = 1/2 × base × height</p> Signup and view all the answers

    What is the converse of the Pythagorean Theorem stating?

    <p>If the square of one side of a triangle is equal to the sum of the squares of the other two sides, then the angle included by these two sides is a right angle</p> Signup and view all the answers

    What can be said about the areas of two triangles with equal bases between the same parallel lines?

    <p>The areas are equal</p> Signup and view all the answers

    What is the condition for two polygons to be similar?

    <p>All pairs of corresponding angles are equal, and all pairs of corresponding sides are in the same proportion</p> Signup and view all the answers

    What is the relation between the corresponding sides of two equiangular triangles?

    <p>The corresponding sides are in the same proportion</p> Signup and view all the answers

    What is the main purpose of a ratio in Euclidean geometry?

    <p>To express how many times one quantity is contained in another</p> Signup and view all the answers

    If ( \frac{a}{b} = \frac{c}{d} ), what is the reciprocal proportion?

    <p>( \frac{b}{a} = \frac{d}{c} )</p> Signup and view all the answers

    In a triangle, if a line is drawn parallel to one side, what is the relationship between the divided sides?

    <p>They are proportional</p> Signup and view all the answers

    What is the name of the theorem that states if a line is drawn parallel to one side of a triangle, it divides the other two sides proportionally?

    <p>Basic Proportionality Theorem</p> Signup and view all the answers

    If ( \frac{a}{b} = \frac{c}{d} ) and ( \frac{a}{c} = \frac{b}{d} ), what can be concluded?

    <p>a, b, c, and d are proportional</p> Signup and view all the answers

    What is the first step in solving proportional problems?

    <p>Identify the given ratios</p> Signup and view all the answers

    If two triangles have proportional corresponding sides, what can be concluded?

    <p>They are similar</p> Signup and view all the answers

    What is the definition of proportion in geometry?

    <p>Two ratios that are equal</p> Signup and view all the answers

    What is the area of a parallelogram with a base of 8 units and a height of 5 units?

    <p>40 square units</p> Signup and view all the answers

    In a triangle, if the base is 6 units and the height is 8 units, what is the length of the median bisecting the base?

    <p>6 units</p> Signup and view all the answers

    If two triangles have proportional corresponding sides, what can be concluded about the triangles?

    <p>They are similar</p> Signup and view all the answers

    What is the formula to find the area of a kite?

    <p>1/2 × diagonal AC × diagonal BD</p> Signup and view all the answers

    What is the formula to find the area of a trapezium?

    <p>1/2 × (base1 + base2) × height</p> Signup and view all the answers

    What is the conclusion of the proportionality of triangles with the same height?

    <p>Triangles with equal heights have areas proportional to their bases</p> Signup and view all the answers

    If two triangles have equal bases and are between the same parallel lines, what can be concluded about their areas?

    <p>They are equal.</p> Signup and view all the answers

    What is the property of proportion that states that if DE is parallel to BC in triangle ABC, then AD/DB = AE/EC?

    <p>Basic Proportionality Theorem</p> Signup and view all the answers

    What is the condition for two triangles to be similar?

    <p>They have proportional corresponding sides.</p> Signup and view all the answers

    What is the statement of the Pythagorean Theorem?

    <p>In any right-angled triangle, the square on the hypotenuse is equal to the sum of the squares on the other two sides</p> Signup and view all the answers

    What is true about equiangular triangles?

    <p>They are similar</p> Signup and view all the answers

    If two triangles are similar, what can be concluded about their corresponding angles?

    <p>They are equal.</p> Signup and view all the answers

    What is true about the areas of two triangles with equal heights and bases of different lengths?

    <p>They are proportional to their bases.</p> Signup and view all the answers

    What is the condition for two triangles to be similar?

    <p>They have proportional corresponding sides</p> Signup and view all the answers

    What can be concluded about two triangles if they have proportional corresponding sides?

    <p>They are similar.</p> Signup and view all the answers

    What is the Mid-point Theorem?

    <p>The line joining the midpoints of two sides of a triangle is parallel to the third side and equal to half its length.</p> Signup and view all the answers

    What is the Proportion Theorem?

    <p>A line drawn parallel to one side of a triangle divides the other two sides proportionally.</p> Signup and view all the answers

    If two polygons are similar, what can be concluded about their corresponding sides?

    <p>They are proportional.</p> Signup and view all the answers

    What is the converse of the Mid-point Theorem?

    <p>The line drawn from the midpoint of one side of a triangle parallel to another side bisects the third side.</p> Signup and view all the answers

    What is the condition for two polygons to be similar?

    <p>All pairs of corresponding angles are equal and all pairs of corresponding sides are in the same proportion.</p> Signup and view all the answers

    What is the consequence of the square of one side of a triangle being equal to the sum of the squares of the other two sides?

    <p>The angle included by the two sides is a right angle</p> Signup and view all the answers

    What is the condition for two triangles to be similar?

    <p>They have proportional corresponding sides</p> Signup and view all the answers

    If two triangles are equiangular, what can be said about their corresponding sides?

    <p>They are in proportion</p> Signup and view all the answers

    What is the formula for the area of a triangle?

    <p>1/2 × base × height</p> Signup and view all the answers

    If two triangles have equal bases and are between the same parallel lines, what can be concluded about their areas?

    <p>They are equal</p> Signup and view all the answers

    What is the result of the similarity of ΔCAD and ΔCBA?

    <p>AC^2 = CB × DC</p> Signup and view all the answers

    If ∆ABC and ∆DEF are similar triangles, what can be concluded about their corresponding angles?

    <p>They are equal</p> Signup and view all the answers

    What is the consequence of having triangles with corresponding sides in proportion?

    <p>The triangles are similar</p> Signup and view all the answers

    What is the purpose of drawing GH in the proof of the theorem 'Triangles with Sides in Proportion are Similar'?

    <p>To prove similarity</p> Signup and view all the answers

    What can be concluded about the areas of two triangles with equal heights and bases of ratio 2:3?

    <p>They are in the ratio 2:3</p> Signup and view all the answers

    In the Pythagorean Theorem, what is the relation between the square on the hypotenuse and the sum of the squares on the other two sides?

    <p>They are equal</p> Signup and view all the answers

    What is the condition for two triangles to be similar?

    <p>They have proportional sides</p> Signup and view all the answers

    If ∆ABC and ∆DEF are similar triangles, what can be concluded about their areas?

    <p>They are proportional</p> Signup and view all the answers

    What is the statement of the theorem 'Triangles with Sides in Proportion are Similar'?

    <p>If two triangles have proportional corresponding sides, then they are similar</p> Signup and view all the answers

    What is true about the areas of two triangles with equal bases between the same parallel lines?

    <p>They are equal</p> Signup and view all the answers

    What is the formula for the area of a triangle?

    <p>A = 1/2 × base × height</p> Signup and view all the answers

    If $\frac{a}{b} = \frac{c}{d}$ and $a = 2c$, what is the value of $\frac{b}{d}$?

    <p>1</p> Signup and view all the answers

    In triangle $\triangle ABC$, if $\overline{DE}$ is parallel to $\overline{BC}$, what is the value of $\frac{AD}{DB}$ if $AE = 4EC$?

    <p>4</p> Signup and view all the answers

    If $\frac{w}{x} = \frac{y}{z}$, what is the value of $\frac{x}{w}$?

    <p>$\frac{z}{y}$</p> Signup and view all the answers

    In triangle $\triangle ABC$, if $\overline{DE}$ is parallel to $\overline{BC}$, what is the relationship between $AD$, $DB$, $AE$, and $EC$?

    <p>$\frac{AD}{DB} = \frac{AE}{EC} = \frac{DB}{AE}$</p> Signup and view all the answers

    If $\frac{a}{b} = \frac{c}{d}$, what is the value of $\frac{a+c}{b+d}$?

    <p>1</p> Signup and view all the answers

    If $\frac{w}{x} = \frac{y}{z}$, what is the value of $\frac{w-y}{x-z}$?

    <p>1</p> Signup and view all the answers

    In triangle $\triangle ABC$, if $\overline{DE}$ is parallel to $\overline{BC}$, what is the value of $\frac{AE}{EC}$ if $AD = 2DB$?

    <p>2</p> Signup and view all the answers

    If $\frac{a}{b} = \frac{c}{d}$, what is the value of $\frac{a+b}{c+d}$?

    <p>1</p> Signup and view all the answers

    If two triangles have proportional corresponding sides, what can be concluded about their corresponding angles?

    <p>They are equiangular</p> Signup and view all the answers

    What is the condition for two polygons to be similar?

    <p>They have proportional corresponding sides</p> Signup and view all the answers

    What is the formula to find the area of a kite?

    <p>Area = (diagonal AC × diagonal BD) / 2</p> Signup and view all the answers

    If two triangles are similar, what can be concluded about their areas?

    <p>They are proportional</p> Signup and view all the answers

    What is the relation between the corresponding sides of two equiangular triangles?

    <p>They are proportional</p> Signup and view all the answers

    What is the converse of the Pythagorean Theorem stating?

    <p>If the square of the hypotenuse is equal to the sum of the squares of the other two sides, then the triangle is right-angled</p> Signup and view all the answers

    What is the formula to find the area of a trapezium?

    <p>Area = (base1 + base2) × height / 2</p> Signup and view all the answers

    If two triangles are similar, what can be concluded about their corresponding sides?

    <p>They are proportional</p> Signup and view all the answers

    What is the condition for two triangles to be similar?

    <p>They have proportional corresponding sides</p> Signup and view all the answers

    What is the name of the theorem that states if a line is drawn parallel to one side of a triangle, it divides the other two sides proportionally?

    <p>Thales' Theorem</p> Signup and view all the answers

    If two triangles have proportional corresponding sides, what can be concluded about their corresponding angles?

    <p>They are equal</p> Signup and view all the answers

    What can be concluded about two triangles if they have proportional corresponding sides?

    <p>They are similar</p> Signup and view all the answers

    What is the condition for similarity of two polygons?

    <p>They have proportional corresponding sides</p> Signup and view all the answers

    What is the statement of the Proportion Theorem?

    <p>A line drawn parallel to one side of a triangle divides the other two sides proportionally.</p> Signup and view all the answers

    What is the conclusion of the Mid-point Theorem?

    <p>The line joining the midpoints of two sides of a triangle is half the length of the third side.</p> Signup and view all the answers

    What is the condition for similarity of two polygons?

    <p>All pairs of corresponding angles are equal and all pairs of corresponding sides are in the same proportion.</p> Signup and view all the answers

    If two triangles are equiangular, what can be concluded about their corresponding sides?

    <p>They are proportional</p> Signup and view all the answers

    What is the converse of the Mid-point Theorem?

    <p>A line drawn from the midpoint of one side of a triangle parallel to another side bisects the third side.</p> Signup and view all the answers

    What is the formula for the area of a triangle with a base of 10 units and a height of 12 units?

    <p>1/2 × 10 × 12</p> Signup and view all the answers

    If two triangles have proportional corresponding sides, what can be concluded about their areas?

    <p>They are proportional</p> Signup and view all the answers

    If ∆ABC and ∆DEF are similar triangles, and AB = 6, BC = 8, and DE = 3, what is the length of EF?

    <p>4</p> Signup and view all the answers

    If ∆ABC and ∆DEF are equiangular triangles, and AB = 4, BC = 5, and DE = 2, what is the length of EF?

    <p>2.5</p> Signup and view all the answers

    In the proof of the theorem 'Triangles with Sides in Proportion are Similar', what is the purpose of drawing GH?

    <p>To prove the similarity of ∆AGH and ∆DEF</p> Signup and view all the answers

    What is the condition for two triangles to be similar?

    <p>They must be equiangular or have proportional corresponding sides</p> Signup and view all the answers

    What is the Pythagorean Theorem used to find?

    <p>The length of the hypotenuse of a right-angled triangle</p> Signup and view all the answers

    If two triangles have equal bases and are between the same parallel lines, what can be concluded about their areas?

    <p>They are equal</p> Signup and view all the answers

    What can be concluded about two triangles if they have proportional corresponding sides?

    <p>They are similar</p> Signup and view all the answers

    What is the relation between the corresponding sides of two equiangular triangles?

    <p>They are proportional</p> Signup and view all the answers

    What is the formula to find the area of a triangle with a base of 6 units and a height of 8 units?

    <p>24</p> Signup and view all the answers

    If ∆ABC and ∆DEF are similar triangles, what can be concluded about their corresponding angles?

    <p>They are equal</p> Signup and view all the answers

    What is the necessary and sufficient condition for a triangle to have a right angle?

    <p>The square of one side is equal to the sum of the squares of the other two sides.</p> Signup and view all the answers

    If ∆ABC and ∆DEF are similar triangles, what can be said about their corresponding sides?

    <p>They are in the same proportion.</p> Signup and view all the answers

    What is the area of a triangle with a base of 5 units and a height of 12 units?

    <p>60 square units</p> Signup and view all the answers

    If two triangles are equiangular, what can be said about their corresponding sides?

    <p>They are in the same proportion.</p> Signup and view all the answers

    What is the condition for two polygons to be similar?

    <p>All pairs of corresponding angles are equal, and all pairs of corresponding sides are in the same proportion.</p> Signup and view all the answers

    What is the converse of the Pythagorean Theorem stating?

    <p>If the square of one side of a triangle is equal to the sum of the squares of the other two sides, then the angle included by these two sides is a right angle.</p> Signup and view all the answers

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