Another geometry question I don’t understand

Question

Determine the exact total surface area of the hemisphere attached to the cylinder:

from top to bottom, the cylinder is 30 cm, and the radius of the hemisphere is 4 cm.

Answer 1

A_base = 16π

A_side = 4π(30), or 120π

A_hemi = (1/2)(4π)4², or 32π

Add the three together and answer

Answer 2

To get the area of the ends r^2pi.

" " " " surface; you want the circumference*height=

d*pi*h+ends*2.