Question

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

A.2 π cm
B.16 π cm
C.4 π cm
D.8 π cm

Answer 1

Area of circle =

`\pi \: r {}^(2)`

`16\pi = \pi \: r {}^(2)`

`16 = r {}^(2)`

`r = √(16)`

`r = 4cm`

Answer 2

`\huge{\underline{\underline{\red{Answer}}}}`

`area \: \: of \: \: a \: \: circle \: = \pi \: {r}^(2) \\ 》 16\pi = \pi {r}^(2) \\ 》 16 = {r}^(2) \\》 r = √(16) \\ 》r = 4cm`