78+ Octagon Angle Sum most complete

78+ Octagon Angle Sum
most complete. A point in the plane has 360. If squares are constructed all internally or all externally on the sides of an octagon.

Each angle of a regular octagon has a measure of ... from us-static.z-dn.net

Sum of the exterior angles in any polygon. The sum of the internal angles of any octagon, either convex or concave is always 1080°. When any internal angle is greater than 180° it is concave.

Each angle measure in a regular quadrilateral.

This can quickly be so the angles of 2 dodecagons and 1 octagon would sum to 435 degrees. Each exterior angle measure 45° which means 45×8 = 135. Sum of the exterior angles in any polygon. An octagon has an interior angle sum of1,080 degrees.