Question

A sphere is inscribed in a cylinder. Show that the surface area of the sphere and the lateral area of the cylinder are equal.

Answer 1

i figured this one out :)

Answer 2

\[r_C=r_S\quad,\quad h_C=2r_S\]\[M=2\pi r_C h_C=2\pi r_S\cdot 2r_S=4\pi r_S^2=S_S\]