If the semi circle is joined together with a straight line then it will have 2 corners and 2 sides.
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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.
it has 2 corners .
It has no angles because circles are not common shapes. Well they're common but they don't have ANY sides, angles, OR CORNERS!
It has 2 sides - one straight and one curved.
a semi - circle has zero parallel lines