Semi means half.
So there are two semicircles in a circle.
Two of them
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Just the one and it is its radius when at right angles to the semi-circle's centre
semi-circle
1
A semi-circle is a two dimensional shape.
A semi-circle is a 180 degree half circle. A semi-circle does not have any corners. A circle does not have corners either. There are points of beginning and end in a semi-circle. In a circle the point of beginning is the same as the ending point.
a semi-circle only has one line of symmetry
a semi-circle only has one line of symmetry
A semi-circle
Circle. That is the opposite of semi circle.
180
two
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Two.
Two of them
Just the one and it is its radius when at right angles to the semi-circle's centre