The interior angles add up to 17640 degrees
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Exterior angles add up to 360 degrees Interior angles add up to 17,640 degrees
A 100 sided polygon may be called a hectogon or hecatontagon, although it is usually referred to as a 100-gon.
External angles would total 360 degrees; internal angles would total 14,400 degrees.
Most mathematicians use "100-gon." Hectogon and centagon are also permissible.
A = C = 180 - B = 80 So A + C = 160