Question 1177833


pi*(r+25)^2 -pi*r^2= (1/2) pi*r^2


pi*(r+25)^2 = (3/2) pi*r^2

(r+25)^2= 3/2 * r^2

r^2+50t +625 = 3/2 * r^2 

r^2-(3/2)r^2=-625

-(1/2) r^2 =-625

r^2= 1250

r = 35 cm