Question

28 The area of a circular play ground is 22176 cm square. Find the cost of fencing
this ground at the rate of 50 per metre.​

Answer 1

Answer:

264Rs

Step-by-step explanation:

πr^2=22176

r=84cm

perimeter=2πr

perimeter=528cm

cost=(528×50)/100

cost=264rs

Answer 2

Given that the area of circular playing field equal to 22176 cm².

Let the radius of the circular field be equal to r.

Area of the circular playing field = πr²

=> 22176 = (22/7) r²

=> r² = 7056

=> r = 84 cm

Radius of the circular playing field = 84 cm

The Circumference of the playing field = 2πr

= (44/7) × 84

= 528 cm = 5.28 m

The cost of fencing the ground = 50 × the circumference of the playing field

= 50 × 5.28

= Rs. 264