## anonymous 5 years ago what is the radius? if a right cylinder has a surface area of 252pi feet and a height of 11feet?

1. anonymous

Right Cylinder SA = SA (top)+SA(bottom) +SA(rest of it) SA = $SA = \pi*r^2 + \pi*r^2 + 2*\pi*rh = 252$ Solve for r : $252 = 2*\pi*r^2 + 2*\pi*r*h$ $2*\pi*r^2 +2*\pi*r*h -252 = 0$ Now use the quadratic formula to find r :D

2. anonymous

thanks:)