The diameter.
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A curved edge and a straight edge which makes two edges
to find the area of a semi circle measure the length of the straight edge, divide by 2, square it and multiply by pi. This will give you the area of the circle. To get the area of the semi-circle divide your answer by 2
The angles of a semi-circle are on a straight line and angles on a straight line add up to 180 degrees.
Semi = half
A semi-circle the answere is semi-circle or a breve