If the radius of a sphere is tripled, the surface area increases by (3)2 = 9 times,
and the volume increases by (3)3 = 27 times.
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The surface area of a sphere with a radius of 15 units is 2,827 units2
The radius is 4.5135
Use the formula for volume to solve for the radius of the sphere and then plug that radius into the formula for the surface area of a sphere.
The surface area of this sphere is 2,123.7 units2676 units2
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.