Question

the total surface area of a solid right circular cylinder is 231 centimetre square its curved surface area is two third of the total surface area find the radius and height of the cylinder

Answer 1

2πr(h+r)=231
2πrh=2/3*2πr(h+r)
2πrh=2/3*231
2πrh=77*2
2*22/7rh=154
rh=154*7/22*2
rh=49/2
rh=24•5
r=24.5/h
2πr(h+r)=231
2*22/7*24.5/h(h+24.5/h)