Find the radius $ r $ of a sphere if area $A = 615.44$.
Answer
$r = 6.9982$
Explanation
To find radius $ r $ use formula:
$$ A = 4 \cdot r^2 \cdot \pi $$After substituting $ A = 615.44 $ we have:
$$ 615.44 = 4 \cdot r^2 \cdot \pi $$ $$ r^2 \cdot \pi = \dfrac{ 615.44 }{ 4 } $$ $$ r^2 \cdot \pi = 153.86 $$ $$ r = \sqrt{ \frac{ 153.86 }{\pi} } $$ $$ r \approx 6.9982 $$This page was created using
Sphere Calculator