No. You can have several angles at a vertex.
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It has 20 vertices or angles. * * * * * No! A dodecagon has 12 vertices. A polygon with 20 vertices is an icosagon.
Angles are measured by degree and vertices happen when two sides meet, and aren't measured.
Yes,because when you count the sides angles and vertices it's all the same
Its angles are determined at its vertices which is the plural of vertex
It is the singular of the plural vertices relating to angles of polygons