No
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'Poly' simply means 'many' or 'multiple', so a polygon is just a shape with any number of sides. Unlike hexagons ('hex'=6) or pentagons ('penta'=5), polygon is just a blanket word for any multi-sided shape. Squares and triangles and rhombuses and semicircles are all polygons. * * * * * Nearly correct. The sides of a polygon must be straight lines so a semicircle is NOT a polygon.
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
a sphere
The diameter of the semicircle will be twice the radius.