Coordinate Geometry Full chapter Material

9th Standard

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Maths

Time : 02:00:00 Hrs
Total Marks : 70
    10 x 1 = 10
  1. The coordinates of the point C dividing the line segment joining the points P(2, 4) and Q(5, 7) internally in the ratio 2:1 is______.

    (a)

    \((\frac{7}{2},\frac{11}{2})\)

    (b)

    (3, 5)

    (c)

    (4, 4)

    (d)

    (4, 6)

  2. If \(P(\frac{a}{3},\frac{b}{2})\)is the mid-point of the line segment joining A(−4, 3) and B(−2, 4) then (a, b) is ______.

    (a)

    (-9, 7)

    (b)

    \((-3, \frac{7}{2})\)

    (c)

    (9, -7)

    (d)

    \((3, -\frac{7}{2})\)

  3. In what ratio does the point Q(1, 6) divide the line segment joining the points P(2, 7) and R(−2, 3) ______.

    (a)

    1 :2

    (b)

    2 :1

    (c)

    1 :3

    (d)

    3 :1

  4. The ratio in which the x-axis divides the line segment joining the points A(a1, b1) and B(a2, b2 ) is ______.

    (a)

    b1 : b2

    (b)

    −b1 : b2

    (c)

    a1 : a2

    (d)

    −a1 : a2

  5. The ratio in which the x-axis divides the line segment joining the points (6, 4) and (1, −7) is ______.

    (a)

    2:3

    (b)

    3:4

    (c)

    4:7

    (d)

    4:3

  6. If the coordinates of the mid-points of the sides AB, BC and CA of a triangle are (3, 4), (1, 1) and (2, −3) respectively, then the vertices A and B of the triangle are ______.

    (a)

    (3, 2), (2, 4)

    (b)

    (4, 0), (2, 8)

    (c)

    (3, 4), (2, 0)

    (d)

    (4, 3), (2, 4)

  7. The mid-point of the line joining (−a, 2b) and (−3a,−4b) is ______.

    (a)

    (2a, 3b)

    (b)

    (−2a, −b)

    (c)

    (2a, b)

    (d)

    (−2a, −3b)

  8. In what ratio does the y-axis divides the line joining the points (−5, 1) and (2, 3) internally ______.

    (a)

    1 :3

    (b)

    2 :5

    (c)

    3 :1

    (d)

    5 :2

  9. If (1,−2), (3, 6), (x, 10) and (3, 2) are the vertices of the parallelogram taken in order, then the value of x is ______.

    (a)

    6

    (b)

    5

    (c)

    4

    (d)

    3

  10. The centroid of the triangle with vertices (−1, −6), (−2, 12) and (9, 3) is

    (a)

    (3, 2)

    (b)

    (2, 3)

    (c)

    (4, 3)

    (d)

    (3, 4)

  11. 15 x 2 = 30
  12. The centre of a circle is (−4, 2). If one end of the diameter of the circle is (−3, 7) then find the other end.

  13. The mid-point of the sides of a triangle are (2, 4), (−2, 3) and (5, 2). Find the coordinates of the vertices of the triangle.

  14. O(0,0) is the centre of a circle whose one chord is AB, where the points A and B are (8,6) and (10,0) respectively. OD is the perpendicular from the centre to the chord AB. Find the coordinates of the mid-point of OD.

  15. The points A(−5, 4) , B(−1, −2) and C(5,2) are the vertices of an isosceles rightangled triangle where the right angle is at B. Find the coordinates of D so that ABCD is a square.

  16. Show that the line segment joining the mid-points of two sides of a triangle is half of the third side
    (Hint: Place triangle ABC in a clever way such that A is (0, 0), B is (2a, 0) and C to be (2b, 2c). Now consider the line segment joining the mid-points of AC and BC. This will make calculations simpler).

  17. Prove that the diagonals of the parallellogram bisect each other. [Hint: Take scale on both axes as 1 cm = a units]

  18. Find the coordinates of the point which divides the line segment joining A(−5,11) and B(4,−7) in the ratio 7:2.

  19. The line segment joining A(6, 3) and B(−1, −4) is doubled in length by adding half of AB to each end. Find the coordinates of the new end points.

  20. A line segment AB is increased along its length by 25% by producing it to C on the side of B. If A and B have the coordinates (−2,−3) and (2,1) respectively, then find the coordinates of C.

  21. A car travels at an uniform speed. At 2 pm it is at a distance of 180 km and at 6pm it is at 360 km. Using section formula, find at what distance it will reach 12 midnight.

  22. If the centroid of a triangle is at (4, −2) and two of its vertices are (3, −2) and (5, 2) then find the third vertex of the triangle.

  23. Find the length of median through A of a triangle whose vertices are A(−1, 3), B(1, −1) and C(5, 1).

  24. The vertices of a triangle are (1, 2), (h, −3) and (−4, k). If the centroid of the triangle is at the point (5, −1) then find the value of \(\sqrt { { (h+k) }^{ 2 }+{ (h+3k) }^{ 2 } } \)

  25. ABC is a triangle whose vertices are A(3, 4), B(−2, −1) and C(5, 3) . If G is the centroid and BDCG is a parallelogram then find the coordinates of the vertex D.

  26. If  \(\left( \frac { 3 }{ 2 } ,5 \right) ,\left( 7,\frac { -9 }{ 2 } \right) \)and\((\frac{13}{2},\frac{-13}{2})\) are mid-points of the sides of a triangle, then find the centroid of the triangle.

  27. 5 x 3 = 15
  28. The point (3, −4) is the centre of a circle. If AB is a diameter of the circle and B is (5, −6), find the coordinates of A.

  29. the mid-point formula to show that the mid-point of the hypotenuse of a right angled triangle is equidistant from the vertices (with suitable points).

  30. If (x, 3), (6, y), (8, 2) and (9, 4) are the vertices of a parallelogram taken in order, then find the value of x and y.

  31. Find the centroid of the triangle whose veritices are A(6, −1), B(8, 3) and C(10, −5).

  32. If the centroid of a triangle is at (−2, 1) and two of its vertices are (1, −6) and (−5, 2), then find the third vertex of the triangle.

  33. 3 x 5 = 15
  34. The mid-points of the sides of a triangle are (5, 1), (3, −5) and (−5, −1). Find the coordinates of the vertices of the triangle.

  35. Find the coordinates of the point which divides the line segment joining the points (3, 5) and (8, −10) internally in the ratio 3:2.

  36. What are the coordinates of B if point P(−2, 3) divides the line segment joining A(−3, 5) and B internally in the ratio 1 : 6?

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