Sphere radius

The surface of the sphere is 60 cm square. Calculate its radius; result round to tenth of cm.

Correct answer:

r =  2.2 cm

Step-by-step explanation:

$$\begin{gathered} S=60 \\ S=4\pi \cdot r^2 \\ r=\sqrt{S\mathrm{/}(4\pi )}=\sqrt{60\mathrm{/}(4\cdot 3.1416)}=2.2\text{ cm} \end{gathered}$$

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