Question 144072
let r=radius __ (pi)(r^2)+100=(pi)((r+3)^2)


dividing by pi and FOILing __ r^2+(100/pi)=r^2+6r+9 __ subtracting r^2+9 __ (100/pi)-9=6r


dividing by 6 __ (100/(6*pi))-(3/2)=r