Question

What is the volume of sphere if we double its radius?​

Answer 1

Correct option is D)
Let the radius of sphere is r
Then volume of sphere =
3
4
​
πr
3

If radius of sphere is doubled then radius is 2r
Then volume of new sphere =
3
4
​
π(2r)
3
=
3
4
​
×8r
3

Then ratio of new and old sphere=
3
4
​
r
3

3
4
​
×8r
3

​
=
1
8
​

Then the radius of sphere is doubled then volume become eight times

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