Fold it in half.
Take the full circle and fold it in half by taking one edge and bringing it to the other side of the circle.
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John Stith Pemberton
Two
In degrees? If so then a full circle is 360 degrees, so a half circle is 180 degrees.
It is exactly like when the moon looks like when it is half full.
The circumference (full circle) is the diameter multiplied by pi. For the "half-circle", you would have to divide that by 2.
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Half of the circle is an arc
a half circle and a circle
A full circle is 360 degrees. 180 degrees is a half circle. 90 degrees is a quarter circle.
The perimeter of a full circle is 2*pi*r. Where, pi is the mathematical constant that is the ratio of any circle's circumference to its diameter, approximately equal to 3.14, and r is the radius of the circle. The perimeter of a semi circle, assumed to be half of a full circle is pi*r where pi and r are previously defined.