The perimeter of a circle is 4πr cm. What is the area of the circle – InterviewSolution

1.

The perimeter of a circle is 4πr cm. What is the area of the circle?

Answer»

Given perimeter of circle = 4πr cm

Which can be written as = 2π(2r)

We know that the perimeter of a circle = 2πr

Therefore we have radius = 2r

We also know that area of circle = πr²

= π(2r)²

= 4πr² cm²

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