Question

The area of a circle is 16π cm2. What is the circle's circumference?

Answer 1

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$area \: \: of \: \: a \: \: circle \: = \pi \: {r}^{2} \\ 》 16\pi = \pi {r}^{2} \\ 》 16 = {r}^{2} \\》 r = \sqrt{16} \\ 》r = 4cm$

Answer 2

Answer:

Area of circle =

$\pi \: r {}^{2}$

$16\pi = \pi \: r {}^{2}$

$16 = r {}^{2}$

$r = \sqrt{16}$

$r = 4cm$