Question

Julie thinks that if you double the radius of the sphere with r=7cm, the surface area will double, Is she right?, Why? PLS HELP

Answer 1

Nope, she's wrong.

Answer 2

pls prove

Answer 3

There's a formula:

A = (L)^2

Answer 4

Area is directly proportional to the square of side.

So now if the length is doubled, the area will be 4 times of the original area.

Answer 5

thanks ^^

Answer 6

I can prove that algebraically as well. But i'm not sure you are going to get that.