Question

Area of circle is 400m. Find its radius and cirumference​

Answer 1

Answer:

Area of circle= 400m²

Now,

Area of circle = πr²

400= 22 × r²

7

400×7 = r²

22

2800 = r²

22

127.2= r²

11.27m = radius

Circumference of circle =2πr

= 2× 22 × 11.27

7

= 44 × 11.27

7

= 6.28× 11.27

Circumference = 70.77m