A gardener
wants to fence a circular garden of diameter 21 m. Find the length of
the rope he needs to purchase, if he makes 2 rounds of fence. Also
find the costs of the rope, if it cost Rs 4 per meter. (Takeπ
)
d = 21 m
r
=
Circumference
= 2πr =
=
66 m
Length of rope required for fencing = 2 × 66 m = 132 m
Cost of 1 m rope = Rs 4
Cost of 132 m rope = 4 × 132 = Rs 528