Find the radius $ r $ of a sphere if volume $V = 15$.
Answer
$r = 1.8923$
Explanation
To find radius $ r $ use formula:
$$ V = \dfrac{ 4 \cdot r^2 \cdot \pi }{ 3 }$$After substituting $ V = 15 $ we have:
$$ 15 = \dfrac{ 4 \cdot r^2 \cdot \pi }{ 3 }$$ $$ 15 \cdot 3 = 4 \cdot r^2 \cdot \pi $$ $$ 45 = 4 \cdot r^2 \cdot \pi $$ $$ r^2 \cdot \pi = \dfrac{ 45 }{ 4 } $$ $$ r^2 \cdot \pi = \frac{ 45 }{ 4 } $$ $$ r = \sqrt{ \frac{ \frac{ 45 }{ 4 } }{\pi} } $$ $$ r \approx 1.8923 $$This page was created using
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