The 19 interior angles of a 19-agon add up to 3060 degrees.
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sum interior angles = (number of sides - 2) × 180°= (8 - 2) × 180°= 1080°The sum of the interior angles of an octagon is 1080°In a regular octagon, divide by 8 for each angle = 135°.
Each interior angle = sum of angles/number of sides
The sum of each pair of interior and exterior angles of a polygon is always 180 degrees.
There is no regular polygon with an interior angle of 20o. If the interior angle is 120o then there are six sides and the sum of the angles is 720o.
Interior angles of a triangle have a sum of 180 degrees.