one circle has a diameter of 10 inches. a second circle has a diameter that is twice the diameter of the first circle What is the ratio of the area of the smaller circle to the larger circle

Answer 1

A1 = pi*5^2 = ? = 25pi
A2 = pi*10^2 = ? = 100pi
Looks like 4 times.

Answer 2

So 1;4 ??? ?? ? ?