What is the surface area of a cylinder with end that are half sphere with a radius of 4 and height of 12?

If the radius of the hemispheres is 4, then that leave 4 units for the length if the straight part of the cylinder.

Total surface area = surface area of 1/2 sphere of radius 4 + lateral surface area of cylinder of radius 4 and height 4 + surface area of 1/2 sphere of radius 4.

= surface area of sphere of radius 4 + lateral surface area of cylinder of radius 4

= 4*3*pi*43 + pi*42*4 = 469.1 cubic units.