Question

Example The radius of a circular plot is 7.7 metres. How much will it cost to fence the
plot with 3 rounds of wire at the rate of 50 rupees per metre?
22​

Answer 1

Step-by-step explanation:

Radius (r) = 7.7 metres

$c = 2\pi \: r$

$= 2 \times \frac{22}{7} \times 7.7 \\ = 2 \times 22 \times 1.1 \\ = 2 \times 24.2 \: \: \: \: \: \: \: \ \\ = 48.8 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$

:. Circumference of the plot = 48.8 m.

:. 3 rounds = 48.8×3 = 126.4 m

Rate of fencing per metre = ₹50.

:. Total cost of fencing = 126.4×50 = ₹6,320.