Find the radius $ r $ of a sphere if area $A = 5$ and volume $V = 51$.
Answer
$r = 0.6308$
Explanation
To find radius $ r $ use formula:
$$ A = 4 \cdot r^2 \cdot \pi $$After substituting $ A = 5 $ we have:
$$ 5 = 4 \cdot r^2 \cdot \pi $$ $$ r^2 \cdot \pi = \dfrac{ 5 }{ 4 } $$ $$ r^2 \cdot \pi = \frac{ 5 }{ 4 } $$ $$ r = \sqrt{ \frac{ \frac{ 5 }{ 4 } }{\pi} } $$ $$ r \approx 0.6308 $$This page was created using
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