Circumference of a circle = 2*pi*radius or pi*diameter
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Divide the circumference by 2*pi will give the radius of the circle.
Pi can be used to calculate the area of a circle Pi can be used to calculate the circumference of a circle
To calculate the area of a circle use this formula: pi x r2.
A circle is two dimensional, it has area but not volume.
The answer depends on what characteristic of a half circle you want to calculate: its area or perimeter or something else.