The Octagon

The Octagon (8 sided polygon) is just the construction of a square, twice!

The construction of the octagon is very similar to the construction of the square.
  1. Draw circle O.
  2. Draw lines OA and OB so that they are perpendicular to each other and so that A and B are on circle O.
  3. Find OE, the bisector of angle AOB. OE intersects circle O at two points of the octagon. Use them to find the rest!

© Apr. 2003 Robin Hu. All Rights Reserved.