Question

Q8: The diameter of a circular garden is 42m. To prevent stray animals from damaging the garden, the gardener wants to put four rounds of fencing (at different heights). the length of wire is 396 m Find
The cost of wire at Rs 12 per metre.

plz send the pic of the answer​

Answer 1

Diameter of the circular garden=21m

∴ Radius of the circular garden=

2

21

m

Now, circumference of circular garden=2πr=2×

7

22

×

2

21

=22×3=66m

The gardener makes 2 rounds of fence so the total length of the rope of fencing =2×2πr=2×66=132m

Since the cost of 1 meter rope=Rs. 4

Therefore, cost of 132 meter rope=4× 132=Rs. 528.

Answer 2

Step-by-step explanation:

Diameter of the circular garden=21m

∴ Radius of the circular garden=

2

21

m

Now, circumference of circular garden=2πr=2×

7

22

×

2

21

=22×3=66m

The gardener makes 2 rounds of fence so the total length of the rope of fencing =2×2πr=2×66=132m

Since the cost of 1 meter rope=Rs. 4

Therefore, cost of 132 meter rope=4× 132=Rs. 528.