V = (pi * radius * radius * height)/2 ie. formula for the volume of a cylinder divided by 2
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A semi-circle is a 2-dimensional figure and so cannot have a volume.
cylinder
Hemisphere volume = [(4 / 3) πr3] / 2
Heron's formula
The perimeter of a circle has the formula 2πr. Therefore the length of a semi circle is πr. But the perimeter of a semi circle also includes the diameter which is 2r. Therefore the perimeter of a semi circle = πr + 2r = r(π + 2)