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