Geometry: Area and Perimeter
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Questions and Answers

What is the formula for the area of a parallelogram?

  • Base × Height (correct)
  • Length + Breadth
  • Length × Height
  • Base + Height
  • The area of a parallelogram is equal to the area of a rectangle formed when it is split along its height.

    True

    What do you call the perpendicular line dropped from a vertex to the opposite side in a parallelogram?

    Height (or altitude)

    The area of a parallelogram is calculated as the product of its base and _____ .

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

    Match the following terms with their definitions:

    <p>Base = The bottom side of the parallelogram. Height = The perpendicular distance from the base to the opposite vertex. Parallelogram = A four-sided figure with opposite sides parallel. Area = The extent of a two-dimensional surface within a boundary.</p> Signup and view all the answers

    If the base of a parallelogram is 10 cm and its height is 5 cm, what is its area?

    <p>50 cm²</p> Signup and view all the answers

    Any side of a parallelogram can be chosen as the base for calculating the area.

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

    Describe how a parallelogram can be transformed into a rectangle.

    <p>By cutting a triangle from one side and moving it to the opposite side, a rectangle can be formed.</p> Signup and view all the answers

    What is the formula for the area of a triangle in relation to the area of a parallelogram?

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

    The height of a triangle is always located inside the triangle itself.

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

    If the base of a parallelogram is 6 cm and its height is 4 cm, what is the area of the parallelogram?

    <p>24 cm²</p> Signup and view all the answers

    The area of a parallelogram is equal to the product of its base and ______.

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

    Match the triangle types with their properties:

    <p>Equilateral Triangle = All sides and angles are equal Isosceles Triangle = Two sides are of equal length Scalene Triangle = All sides are of different lengths Obtuse Triangle = One angle is greater than 90 degrees</p> Signup and view all the answers

    Which of the following statements about congruent triangles is correct?

    <p>Congruent triangles must be equal in shape and size.</p> Signup and view all the answers

    Two triangles can have the same area but still be congruent.

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

    What can be said about the triangles formed by cutting a parallelogram along its diagonals?

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

    What is the perimeter of each semicircular shape disc with a radius of 7 cm?

    <p>36 cm</p> Signup and view all the answers

    The circumference of a circle is always greater than its diameter.

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

    What is the diameter of a circle with a radius of 7 cm?

    <p>14 cm</p> Signup and view all the answers

    The circumference of a semicircle with a radius of 7 cm is _____ cm.

    <p>22</p> Signup and view all the answers

    Match the term to its corresponding value:

    <p>Radius = 7 cm Diameter = 14 cm Circumference of semicircle = 22 cm Perimeter of semicircular disc = 36 cm</p> Signup and view all the answers

    What formula is used to calculate the circumference of a semicircle?

    <p>$ rac{1}{2} imes 2 ext{π}r$</p> Signup and view all the answers

    The total perimeter of the given figure is 88 cm.

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

    If a farmer wants to cover an area with radius 7 m, how many kilograms of fertiliser does he need?

    <p>49 kg</p> Signup and view all the answers

    What is the formula for the area of a circle?

    <p>$ ext{Area} = rac{22}{7}r^2$</p> Signup and view all the answers

    The circumference of a circle is calculated using the formula $2πr$.

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

    What is the area of a circular table-top with a radius of 2 m at the rate of ₹10 per square meter?

    <p>₹40</p> Signup and view all the answers

    The area of a circle can be found by using the formula __________.

    <p>$πr^2$</p> Signup and view all the answers

    Match the following shapes to their calculations:

    <p>Circle = πr² Square = s² Rectangle = l × b Triangle = ½ × base × height</p> Signup and view all the answers

    If the radius of a circle is doubled, how does the area change?

    <p>It quadruples</p> Signup and view all the answers

    The diameter of a circle is twice the radius.

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

    What is the area of a circular garden with a diameter of 9.8 m?

    <p>75.28 m²</p> Signup and view all the answers

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

    <p>Base × Height</p> Signup and view all the answers

    The area of triangle with base 8 cm and height 5 cm is 20 cm².

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

    What is the height of a triangle if the base is 10 cm and the area is 50 cm²?

    <p>10 cm</p> Signup and view all the answers

    The area of a parallelogram with a base of _____ cm and a height of 6 cm is 84 cm².

    <p>14</p> Signup and view all the answers

    Given that the area of parallelogram PQRS is calculated with height QM = 7.6 cm and base SR = 12 cm, what is the area?

    <p>91.2 cm²</p> Signup and view all the answers

    The area of triangle ABC is equal to 30 cm² when the base is 15 cm and the height is 4 cm.

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

    The area of triangle with a base of 22 cm and height of _____ cm is 170.5 cm².

    <p>15.5</p> Signup and view all the answers

    What is the area of the larger circle with a radius of 10 cm?

    <p>314 cm²</p> Signup and view all the answers

    The radius of the smaller circle in the example is 3 cm.

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

    Calculate the area of a circle with a diameter of 49 m using π = 3.14.

    <p>1924.86 m²</p> Signup and view all the answers

    The area of the shaded region between the two circles is ___ cm².

    <p>263.76</p> Signup and view all the answers

    Match the following circles with their respective areas:

    <p>Circle A (radius 10 cm) = 314 cm² Circle B (radius 4 cm) = 50.24 cm² Circle C (radius 3 cm) = 28.26 cm² Circle D (radius 5 cm) = 78.5 cm²</p> Signup and view all the answers

    If the circumference of a circular sheet is 154 m, what is its radius? (Take π = 22/7)

    <p>21 m</p> Signup and view all the answers

    To fence a circular garden of diameter 21 m, the gardener needs a rope of 22 m.

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

    What is the area of a circle with a radius of 14 mm using π = 22/7?

    <p>615.75 mm²</p> Signup and view all the answers

    Study Notes

    Perimeter and Area

    • Parallelograms can be transformed into rectangles of equal area.
    • Area of a parallelogram = base × height
    • The base of a parallelogram can be any side.
    • The height of a parallelogram is the perpendicular distance from the base to the opposite side.
    • Area of a triangle = (1/2) × base × height

    Area of a Triangle

    • Triangles can be combined to form a parallelogram.
    • Area of a triangle is half the area of the parallelogram.
    • The base of a triangle can be any side.
    • The height of a triangle is the perpendicular distance from the base to the opposite vertex.

    Circumference of a Circle

    • The distance around a circular region is called the circumference.
    • Circumference = π × diameter (where π is approximately 3.14)
    • Circumference = 2 × π × radius
    • The ratio of circumference to diameter of a circle is a constant (π).

    Area of a Circle

    • The area of a circle is the amount of space enclosed within the circle edges
    • Area = π × radius × radius (where π is approximately 3.14)

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    Description

    Explore the concepts of area and perimeter in this quiz focused on parallelograms, triangles, and circles. Learn how to calculate areas, understand the relationship between these shapes, and apply formulas effectively. This quiz is ideal for students studying basic geometry.

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