# Radius

Find the radius of the circle with area S = 200 cm².

Correct result:

r =  7.979 cm

#### Solution:

$S=200 \ \text{cm}^2 \ \\ S=\pi r^2 \ \\ \ \\ r=\sqrt{ S/\pi }=\sqrt{ 200/3.1416 }=7.979 \ \text{cm}$

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