Question

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

Answer 1

The original area would be multiplied by the scale factor of 2² to get the new area.

Explanation:

If you double the radius lets so lets do an example

(a=πr²) so

if x is the radius the area would be x²π

double the radius so 2x then the area would be

(2x)²π so 4x²π

4x²π/x²π= 4 so its 4 times greater or

D the last answer or The original area would be multiplied by the scale factor of 2² to get the new area.