there are two angles
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There are 180 degrees in a semi-circle.
None A semicircle is the shape of a protractor (or half a pizza). It has one straight side and one longer curved edge.
All triangles inscribed in a semicircle with one side of the triangle being the diameter of the semicircle are right triangles.
The cross section of the Ram hemi is a semicircle
There are four syllables. (sem-i-cir-cle)