# Chapter 11 | Perimeter and Area | Class-7 DAV Secondary Mathematics

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## Unit 11 Worksheet 4 || Perimeter and Area

1. The area of a triangle Is 90 cm2. If Its base is 15 cm, find its altitude.

2. Find the base of a triangle whose area is 0.48 dm2 and altitude is 8 cm.

3. Find the area of a right triangle whose hypotenuse is 13 cm and one side is 5 cm.

4. Find the area of an isosceles right triangle whose equal sides are 15 cm each.

5. Find the area of an isosceles right triangle having the length of each equal side 5 cm.

6. The base of a triangular field is three times its height. If the cost of cultivating the field at Rs. 36 per hectare is Rs. 486. find its base and height (1 hectare = 10000 m2).

7. In the figure 11.14, ST = 5 cm, OR = 9 cm. The area of the larger triangle is 50 cm2. What is the area of shaded region?

8. The area of a rhombus is 98 m2. If one of its diagonal is 14 m, find the other diagonal.

9. The diagonals of a rhombus are 8 cm and 6 cm respectively. Find its area.

10. Find the area of a rhombus whose side is 13 cm and altitude is 2 cm.

11. The area of a rhombus is 220.5 cm2. If Its altitude Is 17.5 cm, find the length of each side of rhombus.

12. A diagonal of a quadrilateral is 40 m long and the perpendiculars to it from the opposite corners are 8 m and 10 m respectively. Find Its area. (Fig. 11.15)

13. Find the area of a rhombus whose diagonals are 15.2 cm and 24 cm respectively. (Fig. 11.16).

### 4 thoughts on “Chapter 11 | Perimeter and Area | Class-7 DAV Secondary Mathematics”

1. Ridhima

Thank you so much I really need this…..