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

Correct result:

r =  2.2 cm

#### Solution:

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

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