Octagon Study Guide

1. Definition: An octagon is a polygon with eight sides and eight angles.
2. Interior angles: The sum of the interior angles in any octagon is always 1080 degrees.
3. Regular octagon: A regular octagon is one in which all the sides and angles are equal. Each interior angle in a regular octagon measures 135 degrees.
4. Formulas:
   • Sum of interior angles = (n-2) * 180 degrees
   • Each interior angle = Sum of interior angles / number of sides
5. Properties:
   • An octagon has 8 sides and 8 angles.
   • The exterior angles of an octagon add up to 360 degrees.