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Mathematics

Grade9

Easy

Question

When a sphere has a volume of 972π, the radius of the sphere is ____________

9
7
18
21

hint Hint:

The volume of sphere is given by $4 over 3 cross times straight pi cross times left parenthesis r a d i u s right parenthesis to the power of 3 to the power of blank end exponent$

The correct answer is: 9

Volume $equals 4 over 3 πr cubed$ = 972 $straight pi$
$r cubed space equals space 972 space cross times 3 over 4$
$r cubed space equals space 729$
r = $cube root of 729$
radius = 9

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