The area of a circle is $64 π c m^{2}$ $64pi cm^2$ , how do you find its radius?

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Answer 1 · 2016-10-25T13:55:24

$r = 8 c m$ $r = 8 cm$

We know the formula for calculating the area of a circle is $A = π \cdot r^{2}$ $A = pi * r^ 2$ where $r$ $r$ is the radius.

Substituting what we know:

$64 π c m^{2} = π r^{2}$ $64 pi cm^2 = pi r^2$ we solve for $r$ $r$

$64 π \frac{c m^{2}}{π} = π \frac{r^{2}}{π}$ $64 pi (cm^2) / pi = pi r^2 / pi$

$64 c m^{2} = r^{2}$ $64 cm^2 = r^2$

$\sqrt{64 c m^{2}} = \sqrt{r^{2}}$ $sqrt(64 cm^2) = sqrt(r^2)$

$r = 8 c m$ $r = 8 cm$

The area of a circle is 64πcm264pi cm^2, how do you find its radius?