Sorry if it is wrong but i got 1 edge around the top
faces = 2
vertices = 0
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The 2 halves in a circle are the 2 semi circles.
The semi-circle is 0.5 X pi X diameter + diameter The semi-circle is 0.5 X pi X diameter + diameter
It has no angles because circles are not common shapes. Well they're common but they don't have ANY sides, angles, OR CORNERS!
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.
180