Radius

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

Correct answer:

r =  7.9788 cm

Step-by-step explanation:

$$\begin{gathered} S=200{\text{cm}}^2 \\ S=\pi r^2 \\ r=\sqrt{S\mathrm{/}\pi }=\sqrt{200\mathrm{/}3.1416}=7.9788\text{ cm} \end{gathered}$$

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