Question
Find the area $ A $ of a sphere if radius $r = 9\, \text{mm}$.
Answer
$324\pi\, \text{mm}^2$
Explanation
To find area $ A $ use formula:
$$ A = 4 \cdot r^2 \cdot \pi $$After substituting $r = 9\, \text{mm}$ we have:
$$ A = 4 \cdot \left( 9\, \text{mm} \right)^{2} \cdot \pi $$ $$ A = 324\, \text{mm}^2 \cdot \pi $$ $$ A = 324\, \text{mm}^2 \cdot \pi $$This page was created using
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