The internal angles of an n-sided shape add to (n-2)*180 degrees.
So, for an 8-sided shape, they would add to 6*180 = 1080 degrees.
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The internal angles of an n-sided shape add to (n-2)*180 degrees.
So, for an 80sided shape, they would add to 6*180 = 1080 degrees.
Interior angles add up to 540 degrees Exterior angles add up to 360 degrees
Exterior angles add up to 360 degrees Interior angles add up to 1800 degrees so all together 2160
Exterior angles add up to 360 degrees Interior angles add up to 900 degrees
Exterior angles add up to 360 degrees Interior angles add up to 17,640 degrees
The interior angles of a heptagon add up to 900 degrees