Question

What will be the circumference of a circle if the area is 64cm
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Answer 1

Given that area of circle is 64cm we can assume we will need to first find radius and then calculate circumference.

First we know that area of a circle is
`A=\pi r^2` hence
`r=\sqrt{(A)/(\pi)}`

We can now put in our area,

`r=\sqrt{(64)/(\pi)}\approx20.37`

Then we use the formula for circumference,

`C=2\pi r\Longrightarrow C=2\pi\cdot20.37\approx\boxed{128\mathbf{cm}}`

Hope this helps.

r3t40