This is a 21 sided polygon and therefore has 21 angles.
NOTE : The name supplied for this polygon is an artificial name and never used in practice. General usage refers to this shape as a 21-gon.
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Infinite angles. If you are referring to degrees then the answer is 360, but if the question is angles I can get as many angles as I want inside a circle.
A triangle has three internal angles and three external angles, for a total of six angles.
There are 14 angles in a tetrahedron
There are many angles inside a circle. You have inscribed angles, right angles, and central angles. These angles are formed from using chords, secants, and tangents.
10 sides and 10 angles