The ** Isosceles Triangle** tool allows you to create an isosceles triangle (a triangle with two equal side) in
the following ways.

- Vertex to base corner
- Vertex to base center (uses Mark Button)
- Base corner to vertex
- Base center to vertex (uses Mark Button)
- Base corner to base corner (uses Mark Button)
- Base center to base corner (uses Mark Button)
- Vertex to base corner with freely positioned base (uses Mark Button)
- Base corner to vertex with freely positioned base (uses Mark Button)

All of these construction options allow you to do things that would otherwise be very difficult if only one construction method were available.
Suppose, for instance, you have a rectangle rotated at an odd angle (23°, for example), and you want to add an isosceles triangle to the side.
Simply use the *Base Corner to Base Corner* construction option. Start the construction at one corner, draw the base over
to the other corner, mark the base length there, and then define the height. You’ll see a graphical depiction of the methods in the
option button. Here’s an example.