Answer
$a_1^2,a_2^2,a_3^2,...$ is a geometric sequence whose common ratio is $r^2$
Work Step by Step
$\frac{a_2}{a_1}=r$
$\frac{a_3}{a_2}=r$
...
$\frac{(a_2)^2}{(a_1)^2}=(\frac{a_2}{a_1})^2=r^2$
$\frac{(a_3)^2}{(a_2)^2}=(\frac{a_3}{a_2})^2=r^2$
...
$a_1^2,a_2^2,a_3^2,...$ is a geometric sequence whose common ratio is $r^2$
