Question

If the radius of a sphere is double, then
What is the ratio of their surface area?
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Answer 1

Answer:

Initial radius = r

final radius = 2r = r²

initial surface area / final surface area= 4 π r² / 4π r'²

= r²/r'²

= r²/(2r)²

= r²/4r²

= 1/4

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required ratio of surface area is 1:4

hope this will help you ◉‿◉

Answer 2

Heya mate ❤

If the radius of a sphere is doubled then the surface area will increase four times.

Radius = r

Surface Area = 4*22/7*r*r.the surface area of sphere will increase 4 times if the radius of that sphere is doubled.

Radius = 2r

Surface area = 4*22/7*2r*2r = 4*22/7*4*r*r = 4(4*22/7*r*r).

Hence, the surface area of sphere will increase 4 times if the radius of that sphere is doubled.