Each interior angle of a regular 45-gon measures 172 degrees
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Providing that it is a regular 20 sided icosagon the each interior angle measures 162 degrees
Normally 4 sides as in a square or a rectangle
It depends on a few factors: if the angle is interior, if the angle is exterior, and if the hexagon is a regular hexagon or not. Each interior angle of a regular hexagon is 120o. Each exterior angle of a regular hexagon is 60o.
135 Each interior angle of a regular octagon measures 135 degrees.
Interior angle 177.12 degrees Exterior angle 2.88 degrees