a semicircle is half of a circle... so like a circle cut in half, in a straight line. just for some information you may also need in the future:
area of a semicircle: multiply the radius by itself and then multiply that by pi (approx. 3.14). divide that by 2.
perimeter (circumference) of a semicircle: pi times radius.
hope that helps.
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Calculating the radius of a semicircle depends on what information about the semicircle is given.
A semicircle means a half circle.
A right angle triangle will fit into a semicircle.
Semicircle
The complete arc of a semicircle is 180 degrees