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Just the one and it is its radius when at right angles to the semi-circle's centre
None, however the semicircle has one folding axis of symmetry perpendicular to the midpoint of the straight side
The semi circle is a shape which has 1 line of symmetry 1straight side 0 equal length sides 0 parallel sides 2 vertices 0 diagnals
Semi means half. So there are two semicircles in a circle.
A triangle with only two of its sides equal. Also a semi-circle or any incomplete circle.