Question

6. If the radius of a sphere is doubled, then find
the ratio of their volumes.​

Answer 1

Answer:

If the radius of a sphere is doubled , then the increase in surface area is 300%

Explanation:

let r is the radius of a sphere

then its surface area =

If the radius is doubled

then its surface area =

So its surface area becomes 4-fold

or we can say that

The increase in surface area is 300% when the radius of a sphere is doubled.

Therefore it is concluded that if the radius of a sphere is doubled then the ratio of their surface area​ is 4 times the old area.

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Answer 2

Answer:

If the radius of a sphere is doubled , then the increase in surface area is 300% The increase in surface area is 300% when the radius of a sphere is doubled. Therefore it is concluded that if the radius of a sphere is doubled then the ratio of their surface area is 4 times the old area.