Assignment – 5
( Heron’s Formula )
1. A board in a
shape of triangle having equal dimensions ‘a’. Find the area of
board using Heron’s formula. If its perimeter is 180 cm. What will be the area
of board ?
2. A board in a
shape of triangle having equal dimensions ‘a’. Find the area of
board using Heron’s formula. If its perimeter is 120 cm. What will be the area
of board ?
3. The triangle
board having the side walls of 122 cm , 22 cm and 120 cm . The rent of
advertisement on board is 6000 rs per cm^2 per year . A company hired this
walls for their advertisement for 3 months how much this company have to pay .
4. The triangle
board having the side walls of 16 cm , 18 cm and 18 cm . The rent of
advertisement on board is 6000 rs per cm^2 per year . A company hired this
walls for their advertisement for 3 months how much this company have to pay .
5. The sides of
a park is 15 cm , 11 cm and 6 cm. Find the area of this park.
6. The sides of
a park is 30 cm , 22 cm and 12 cm. Find the area of this park.
7. Find the
area of triangle two sides of which 9 cm and 5 cm and the perimeter is 21 cm.
8. Find the
area of triangle two sides of which 8 cm and 6 cm and the perimeter is 22 cm.
9. Side of a
triangle are in the ratio of 18 : 10 : 14 and its perimeter is 210 cm . Find
its area .
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| maths ncert solutions |
10. Side of a
triangle are in the ratio of 9 : 5 : 7 and its perimeter is 210 cm . Find its
area .
11. An
isosceles triangle has perimeter 25 cm and each of the equal side is 8 cm .
Find the area of triangle.
12. An
isosceles triangle has perimeter 25 cm and each of the equal side is 9 cm .
Find the area of triangle.
13. A field in the shape of quadrilateral ABCD having angle B is 90
where AB = 3 m BC = 4 m CD = 8 m DA
= 9 m
14. A field in the shape of quadrilateral ABCD having angle B is 90
where AB = 8 m BC = 6 m CD = 7 m DA
= 9 m
15. A field in the shape of quadrilateral ABCD where AB = 3
m BC = 4 m AC = 5 cm CD = 8 m DA =
9 m
16. A field in the shape of quadrilateral ABCD where AB = 8 m BC
= 6 m AC = 10 cm CD = 7 m DA = 9 m
17. A triangle and a parallelogram have the same base and the same area .
If the sides of triangles are 13 cm , 14 cm and 15 cm and the parallelogram
stands on the base 14 cm. Find the height of parallelogram.
18. A triangle and a parallelogram have the same base and the same area .
If the sides of triangles are 6 cm , 8 cm and 10 cm and the parallelogram
stands on the base 6 cm. Find the height of parallelogram.
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