Question

describe the effect on the area of a circle when the radius is doubled

Answer 1

Well, what do YOU think the effect is?

Answer 2

it will double?

Answer 3

Unfortunately not.

Area = pi r^2

if r doubles, it becomes pi (2r)^2 = 4r^2

Answer 4

In general, if you change the length by a factor of k, the area changes by a factor of k^2, and the volume by a factor of k^3

Answer 5

So It increases 4 times

Answer 6

It does.

Answer 7

thanks