Question

Radius of a sphere is r. How many times does the area increase if radius is doubled.​

Answer 1

Answer:

4 times

If 'radius' is doubled, then the radius can be written as 2r. Hence, the surface area of sphere will increase 4 times if the radius of that sphere is doubled.

Answer 2

Answer:

tsa of sphere is 4/3πr*r

if r is doubled =2r then

tsa= 4/3π(2r)*(2r)

=4/3π4r*r

thus, the area become 4 times the original area.