Coordinate Geometry Exercises

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Questions and Answers

What is the value of k for the points (8, 1), (k, -4), and (2, -5) to form an area of 0?

  • 2
  • 4
  • 3 (correct)
  • 1

What are the coordinates of the midpoint D between points (0, -1) and (2, 1)?

What are the coordinates of the point P, which divides the segment joining (4, -1) and (-2, -3) in the ratio 1:2?

  • (2, 5/3)
  • (0, -7/3)
  • (4, -1)
  • (2, -5/3) (correct)

What is the x-coordinate of the point Q, which divides the line segment joining (4, -1) and (-2, -3) in the ratio 2:1?

<p>0 (A)</p> Signup and view all the answers

If Niharika posts a green flag at coordinates (2, 25), what fraction of the distance AD has she run?

<p>1/4 (C)</p> Signup and view all the answers

What are the coordinates of Preet's red flag when he has run 1/5 of the distance AD?

<p>(8, 20) (D)</p> Signup and view all the answers

How far apart, in meters, are Niharika's green flag and Preet's red flag?

<p>5√5 (C)</p> Signup and view all the answers

Where should Rashmi post her blue flag to be exactly halfway between the other two flags?

<p>(5, 45/2) (D)</p> Signup and view all the answers

What is the ratio in which the line segment joining the points (-3, 10) and (6, -8) is divided by the point (-1, 6)?

<p>2:3 (D)</p> Signup and view all the answers

What is the y-coordinate of point P, where Rashmi posts her blue flag?

<p>45/2 (A)</p> Signup and view all the answers

What are the coordinates of the midpoint D of side BC in triangle ABC?

<p>(4, 0) (C)</p> Signup and view all the answers

What is the area of triangle ABD?

<p>3 square units (D)</p> Signup and view all the answers

In the equation of the line 2x + y - 4 = 0, what does k represent when the line divides segment AB?

<p>The ratio in which the line divides the segment (C)</p> Signup and view all the answers

What is the value of k when the line divides segment AB in the given problem?

<p>2/9 (D)</p> Signup and view all the answers

Which equation represents the condition for the points (x, y), (1, 2), and (7, 0) to be collinear?

<p>x + 3y - 7 = 0 (D)</p> Signup and view all the answers

If areas of triangles ABD and ACD are both 3 square units, what does this indicate about median AD?

<p>It divides triangle ABC into two triangles of equal area. (A)</p> Signup and view all the answers

Which of the following points lies on the vertical line drawn through point B?

<p>(3, -7) (C)</p> Signup and view all the answers

What is the area of triangle ACD when applying the same formula as for triangle ABD?

<p>3 square units (C)</p> Signup and view all the answers

What is the center of the circle with equations for the radii OA, OB, and OC given the coordinates of point O?

<p>(3, -2) (C)</p> Signup and view all the answers

What is the value of y when equating OB and OC, leading to the equation derived from the problem?

<p>-2 (D)</p> Signup and view all the answers

Given two opposite vertices of a square at (-1, 2) and (3, 2), what is the length of the diagonal AC?

<p>4 (A)</p> Signup and view all the answers

What is the coordinate of point O, the intersection of diagonals AC and BD, for the given square vertices?

<p>(1, 2) (B)</p> Signup and view all the answers

After finding the coordinates of point D, which equation represents the equality of sides AD and CD?

<p>(x1 + 1)^2 + (y1 - 2)^2 = (x1 - 3)^2 + (y1 - 2)^2 (C)</p> Signup and view all the answers

What must be solved to determine the coordinates of point D in the square?

<p>8 (C)</p> Signup and view all the answers

What do the diagonals of a square do relative to one another?

<p>Are equal and bisect each other. (A)</p> Signup and view all the answers

If the x-axis divides the line segment joining points A (1, -5) and B (-4, 5), what are the coordinates of the point of division?

<p>(-3/2, 0) (A)</p> Signup and view all the answers

What are the coordinates of point C if the parallelogram has vertices A(1, 2), B(4, y), D(3, 5) and the midpoint condition is satisfied?

<p>(6, 3) (D)</p> Signup and view all the answers

Given the center of a circle at (2, -3) and point B at (1, 4), what are the coordinates of point A if AB is the diameter?

<p>(3, -10) (B)</p> Signup and view all the answers

If point P divides the line segment AB in the ratio 3:4 where A is at (-2, -2) and B is at (2, -4), what is the y-coordinate of point P?

<p>-3 (A)</p> Signup and view all the answers

Which of the following pairs of coordinates represents the points that divide the segment joining A(1, -5) and B(-4, 5) by the x-axis?

<p>(-3/2, 0) (A)</p> Signup and view all the answers

In a parallelogram with vertices A(1, 2), B(4, y), C(x, 6), and D(3, 5), if the midpoint condition holds, what is the value of y?

<p>3 (D)</p> Signup and view all the answers

What is the ratio in which the line segment joining points (-2, -2) and (2, -4) is divided by point P if AP is 3/7 AB?

<p>3:4 (A)</p> Signup and view all the answers

What are the coordinates of point D which divides line segment AB in the ratio 1:3?

<p>(13/4, 23/4) (A)</p> Signup and view all the answers

What is the area of triangle ABC given the vertices A (4, 6), B (1, 5), and C (7, 2)?

<p>15/2 sq units (D)</p> Signup and view all the answers

What is the ratio of the area of triangle ADE to the area of triangle ABC?

<p>1:16 (A)</p> Signup and view all the answers

If the vertices of triangle ABC are A(4, 2), B(6, 5), C(1, 4), what are the coordinates of point D, the midpoint of line segment BC?

<p>(3.5, 4.5) (C)</p> Signup and view all the answers

What are the coordinates of point P on AD such that AP:PD = 2:1?

<p>(6/4, 11/4) (D)</p> Signup and view all the answers

If the coordinates of points Q and R divide medians BE and CF in the ratio 2:1, which of the following best describes their positions?

<p>Both Q and R lie within triangle ABC. (B)</p> Signup and view all the answers

What is the centroid of triangle ABC with vertices A (x1, y1), B (x2, y2), and C (x3, y3)?

<p>((x1 + x2 + x3)/3 , (y1 + y2 + y3)/3) (C)</p> Signup and view all the answers

Which of the following accurately reflects the properties of medians in triangle geometry?

<p>The centroid is the point where all medians intersect. (C)</p> Signup and view all the answers

What is the area of the triangle formed by points (0, -1), (2, 1), and (0, 3)?

<p>4 square units (B)</p> Signup and view all the answers

What is the area of ΔDEF, which is formed by joining the midpoints of ΔABC?

<p>1 square unit (B)</p> Signup and view all the answers

What is the ratio of the area of the triangle formed by the midpoints to the area of the original triangle?

<p>1:4 (C)</p> Signup and view all the answers

What is the total area of the quadrilateral with vertices (-4, -2), (-3, -5), (3, -2), and (2, 3)?

<p>28 square units (D)</p> Signup and view all the answers

When the median of a triangle divides it into two triangles, what can be said about their areas?

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

What is the calculated area for triangle ΔABC with vertices A (4, -6), B (3, -2), and C (5, 2)?

<p>6 square units (C)</p> Signup and view all the answers

What expression is used to find the area of a triangle given its vertices?

<p>1/2 × [x1(y2 - y3) + x2(y3 - y1) + x3(y1 - y2)] (B)</p> Signup and view all the answers

What are the coordinates of the midpoints D, E, and F for the triangle with vertices A(0, -1), B(2, 1), and C(0, 3)?

<p>(1, 0), (0, 1), (1, 2) (D)</p> Signup and view all the answers

Flashcards

Internal Division of a Line Segment

A point that divides a line segment into two parts with a specific ratio

Trisection point P

A line segment is divided into two parts by a point, AP = PQ = QB and the ratio is 1:2

Trisection point Q

A line segment is divided into two parts by a point, AP = PQ = QB, and the ratio is 2:1

Section Formula

A formula that determines the coordinates of the point that divides a line segment in a given ratio.

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Distance Formula

The distance between two points on a coordinate plane can be calculated using this formula.

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Midpoint Formula

A point that divides a line segment into two equal parts

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Green Flag Location

The coordinate (2, 25) is the location of the green flag, since Niharika ran 1/4th the distance AD.

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Red Flag Location

The coordinate (8, 20) is the location of the red flag, since Preet ran 1/5th the distance AD.

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X-intercept

The point where a line intersects the x-axis is called the x-intercept. The y-coordinate of any point on the x-axis is always 0.

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Properties of Parallelogram

A parallelogram is a quadrilateral with opposite sides parallel and equal in length. The diagonals of a parallelogram bisect each other. This means they intersect each other at their midpoints.

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Diameter of a Circle

The diameter of a circle is a line segment that passes through the center of the circle and has endpoints on the circle. The center of the circle is the midpoint of the diameter.

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Ratio and Division of Line Segment

The ratio in which a line segment is divided by a point can be used to find the coordinates of the point of division. The coordinates of the point of division are a weighted average of the coordinates of the endpoints of the line segment, where the weights are given by the ratio.

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Ratio and Line Segments

The relationship between the lengths of line segments AP and AB can be represented by a ratio. If the ratio is known, the coordinates of point P can be calculated using the section formula.

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Section Formula in Coordinate Geometry

The section formula is used to find the coordinates of a point that divides a line segment in a given ratio. The formula involves the coordinates of the endpoints of the line segment and the ratio in which the line segment is divided.

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Area of a Triangle

The area of a triangle is calculated by taking half the product of the base and its corresponding height.

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Midpoint

A point that lies exactly in the middle of a line segment, dividing it into two equal parts.

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Area of a Quadrilateral

The area of a quadrilateral can be calculated by dividing it into triangles and summing their individual areas.

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Area of a Triangle with Coordinates

The area of a triangle can be calculated using a formula involving the coordinates of its vertices.

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Triangle formed by Midpoints

The area of a triangle formed by joining the midpoints of the sides of a larger triangle is always one-fourth the area of the bigger triangle.

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Midpoint Formula: Special Case of Section Formula

The midpoint formula is a special case of the section formula where the ratio is 1:1. It's used to find the midpoint of a line segment.

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Collinear Points

Two points on a coordinate plane are collinear when the points lie on the same line.

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Collinear Points and Area of Triangle

If three points are collinear, then the area of the triangle formed by them is zero. This is because a triangle doesn't exist if all points are on the same line.

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Center of a Circle

The center of a circle is equidistant from all points on the circle's circumference. To find the center of a circle, calculate the midpoint of the line segment between any two points on the circle. This will give you the center.

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Finding the Center of a Circle

The center of a circle is the point equidistant from all points on the circle. To find the center, use the fact that radii of the same circle are equal.

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Properties of a Square

A square has four equal sides and four right angles. The diagonals of a square bisect each other at right angles, meaning they cut each other in half at their midpoints.

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Center of a Square

The coordinates of the center of a square can be found by averaging the x-coordinates and y-coordinates of two opposite vertices.

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Finding Other Vertices of a Square

To find the coordinates of the other vertices of a square, use the fact that the sides are equal in length and the angles are right angles. You can use the distance formula to find the length of a side.

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Pythagorean Theorem

The Pythagorean theorem states that in a right triangle, the square of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides. It can be used to find the length of a side of a right triangle if the lengths of the other two sides are known.

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Median of a triangle

In a triangle, the line segment joining a vertex to the midpoint of the opposite side is called a median.

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Centroid of a triangle

The point where all three medians of a triangle intersect is called the centroid.

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Centroid division ratio

The centroid divides each median in the ratio 2:1.

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Centroid coordinates formula

The coordinates of the centroid of a triangle with vertices (x1, y1), (x2, y2), and (x3, y3) are [(x1 + x2 + x3)/3, (y1 + y2 + y3)/3].

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Area of a triangle (coordinates)

The area of a triangle can be calculated using the formula: Area = ½ × [x1(y2 – y3) + x2(y3 – y1) + x3(y1 – y2)], where (x1, y1), (x2, y2), and (x3, y3) are the coordinates of the triangle's vertices.

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Internal division formula

The coordinates of a point dividing a line segment internally in the ratio m1:m2 can be calculated using the formula: x = (m1x2 + m2x1)/(m1 + m2) and y = (m1y2 + m2y1)/(m1 + m2), where (x1, y1) and (x2, y2) are the coordinates of the endpoints.

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Study Notes

Coordinate Geometry Exercises

  • Distance Formula: Used to find the distance between two points (x₁, y₁) and (x₂, y₂). The formula is √((x₂ - x₁)² + (y₂ - y₁)²).
  • Midpoint Formula: Finds the midpoint of a line segment with endpoints (x₁, y₁) and (x₂, y₂). Formula: ((x₁ + x₂)/2, (y₁ + y₂)/2).
  • Section Formula: Calculates the coordinates of a point dividing a line segment in a given ratio. If a point divides a line segment in the ratio m:n, the coordinates are ((nx₁ + mx₂)/(m+n), (ny₁ + my₂)/(m+n)).
  • Collinear Points: Points are collinear when they lie on the same straight line. The area of the triangle formed by these points is zero.

Isosceles Triangle Check

  • Identifying Isosceles: To determine if three points form an isosceles triangle, calculate the distance between each pair of points. If any two distances are equal, the triangle is isosceles.

Quadrilaterals

  • Identifying Quadrilaterals: Analyze the distances between the vertices of a quadrilateral. Equal sides suggest a rhombus, equal opposite sides imply a parallelogram. Calculation of lengths of the diagonals helps distinguish shapes. Lengths of opposite sides indicate parallelograms. Diagonals equalling or not equalling each other provide information about different shapes (squares, rectangles).

Area of Triangles and Quadrilaterals

  • Triangle Area: To find the area of a triangle, use the formula Area= 1/2|x₁(y₂-y₃) + x₂(y₃-y₁) + x₃(y₁-y₂)| , where (x₁, y₁), (x₂, y₂), and (x₃, y₃) are the coordinates of the vertices.
  • Quadrilateral Area: Divide a quadrilateral into triangles for calculating its area. Alternatively use the formula Area= 1/2|x₁(y₂-y₄)+x₂(y₃-y₁)+x₃(y₄-y₂)+x₄(y₁-y₃)| . The area of a rhombus is 1/2 * (product of diagonals).

Problems Involving X-axis

  • Point on the X-axis: Any point on the x-axis has a y-coordinate of 0.
  • Distance: The x-coordinate of a point on the x-axis is equidistant from given coordinate points (x, y) is given by a specific formula

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