**10th Maths Book Back Question and Answers – Chapter 5 Exercise 5.1:**

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**Samacheer Kalvi 10th Maths Book Back Answers – Ex 5.1 Coordinate Geometry**

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**Chapter 5**

**Exercise 5.1 Coordinate Geometry**

1. Find the area of the triangle formed by the points

(i) (1, -1), (-4, 6) and (-3, -5)

(ii) (-10, -4), (-8, -1) and (-3, -5)

**Solution:**

(ii) (-10, -4), (-8, -1) and (-3, -5)

2. Detemine whether the sets of points are collinear?

**Solution:**

(i)

∴ The given points are collinear

3. Vertices of given triangles are taken in order and their areas are provided aside. In each case, find the value of ‘p’.

**Solution:**

Area 20 sq. units.

8p = 104

p = 13

4. In each of the following, find the value of ‘a’ for which the given points are collinear.

(i) (2, 3), (4, a) and (6, -3)

(ii) (a, 2 – 2a), (-a + 1, 2a) and(-4 – a,6 – 2a)

**Solution:**

5. Find the area of the quadrilateral whose vertices are at

(i) (-9, -2), (-8, -4), (2, 2) and (1, -3)

(ii) (-9, 0), (-8, 6), (-1, -2) and (-6, -3)

**Solution:**

(i) (-9, -2), (-8, -4), (2, 2), and (1, -3)

(ii) (-9, 0), (-8, 6), (-1, -2) and (-6, -3)

6. Find the value of k, if the area of a quadrilateral is 28 sq.units, whose vertices are (-4, -2), (-3, k), (3, -2), and (2, 3)

**Solution:**

7. If the points A(-3, 9) , B(a, b) and C(4,-5) are collinear and if a + b = 1, then find a and b.

**Solution:**

8. Let P(11, 7), Q(13.5, 4) and R(9.5, 4) be the mid-points of the sides AB, BC and AC respectively of ∆ABC. Find the coordinates of the vertices A, B and C. Hence find the area of ∆ABC and compare this with area of ∆PQR.

**Solution:**

p (11, 7), Q (13.5, 4), and R (9.5, 4) are the mid points of the sides of a ∆ABC.

9. In the figure, the quadrilateral swimming pool shown is surrounded by concrete patio. Find the area of the patio.

**Solution:**

Area of the patio = Area of the quadrilateral ABCD – Area of the swimming pool EFGFI.

Area of the quadrilateral ABCD

10. A triangular-shaped glass with vertices at A(-5, -4), B(1, 6) and C(7, -4) has to be painted. If one bucket of paint covers 6 square feet, how many buckets of paint will be required to paint the whole glass, if only one coat of paint is applied.

**Solution:**

11. In the figure, find the area of

(i) triangle AGF

(ii) triangle FED

(iii) quadrilateral BCEG

**Solution:**

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