Question

The surface area of sphare is same as the curved surface area of the right circular cylinder whose height and diameter are 12cm each .The radius of the sphere is ?

Answer 1

Total surface area of a sphere = 4$\pi$$r^{2}$
Curved surface area of a cylinder = 2[tex] \pi [/tex]rh
⇒ 4$\pi$$r^{2}$  = 2$\pi$rh
⇒(4)(6)(6) = (2)(6)(h)
⇒h = 12 cm (ANS)