Question

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

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 $r=\sqrt{\dfrac{A}{\pi}}$

We can now put in our area,

$r=\sqrt{\dfrac{64}{\pi}}\approx20.37$

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.

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