Question

the area of circular playground is 22176 m2 . find the cost of fencing this ground at the rate of rupees 50 per metre

Answer 1

Assume radius of playground be R cm
so, $\pi$$R^{2}$
 22*7*R*R = 22176
or, R*R = 7056
or, R= 84
Perimeter of playground = 2*22/7*84  = 528 m
Cost of fencing = 528*50 = Rs 26400

Answer 2

Answer:

Rs. 26387.99

Step-by-step explanation:

Area of circular playground = $\pi r ^2$

Since we are given that  area of circular playground is 22176 sq.m .

So, $22176=3.14 \times  r ^2$

$\frac{22176}{3.14}=r ^2$

$7062.4203=r ^2$

$\sqrt{7062.4203}=r$

$84.0382=r$

Circumference of circular ground = $2 \pi r$

                                                      = $2\times 3.14\times 84.0382$

                                                      = $527.759896 m$

Cost of fencing 1 sq.m. = rs.50

Cost of fencing 527.759896 sq.m. = $527.759896 \times 50=26387.99$

Hence the cost of fencing is Rs. 26387.99