Cut a circle in two exact halfs and you'll know :)
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semi-circle
A semi-circle the answere is semi-circle or a breve
Semi = half
The radius of a semi-circle is the same as the radius of the circle that was cut in half. The radius of a circle is the distance from the center of the circle to any point on the circle. That's the same as 1/2 of the diameter. It's easy to measure it on a semi-circle, because you don't even need to determine where the center is. The diameter is just the length of the flat side, and the radius is half of that.
A 3D semi circle