Construct a Regular Octagon
Using the tools in the toolbar the below, construct
a regular octagon with AB as one of its sides. "Regular" means that
all 8 sides are the same length, and make the same angle with each
other.
You should have already completed the
midpoint problem, so that you are
familiar with how to use the tools. To decrease the tedious parts
that you already know how to do, three more tools have been added:
 Constructing a perpendicular to a given line through a point (click
on the line, then drag to the desired point).
 Finding the midpoint between two given points (click one point,
drag to the other)
 Bisecting an angle (click on the line making one side of the
angle, then the other.)
This exercise has no builtin hints, so you just have to do it. When
you construct one of the sides of the octagon, it will appear in green rather
than blue.
After you have successfully made the construction, enter the password
you get at the bottom of the page so I can give you credit.
This page requires a javaenabled browser for correct
functioning. If you can't get it to work, you can do the construction with
other software, or pencil and paper. It is easier for me if you can get
this to work, of course, since then the computer grades it.
