Question 1055761
A is original area and 4A is the new area.
{{{system(A=pi*r^2,4A=pi(2r)^2)}}}


Calculating for the new area,
{{{4A=pi*4*r^2}}}
{{{4A(1/4)=(1/4)4*pi*r^2}}}
{{{A=pi*r^2}}}