Question

what is the radius? if a right cylinder has a surface area of 252pi feet and a height of 11feet?

Answer 1

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

Answer 2

thanks:)