How to get radius if you have surface area of a cylinder as given value and height?
[7] 2pi*r^2+2pi*r*h=SA 2pi(r^2+r*h)=SA r^2+r*h=SA/2pi Now,substitue the values of h,SA and Pi and we have a quadratic equation in the form of (say) r^2+8h=20 The quadratic equation is to be solved now r^2+8h-20=0 (r+10)(r-2)=0 r= -10 or 2 We have to ignore the negative value of r as the radius cannot be negative
