Being half of the circumference of a circle, a semi circle has one side
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If its 2d its called a semi-circle, if its 3d its called a semi-sphere.
It is a semicircle.
Just the one and it is its radius when at right angles to the semi-circle's centre
semi-circle
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.