In the applet below, you can drag the slider to enlarge the triangle. You can also drag points B and C to see other variations.
After playing with the applet, what is it about the sides of a triangle that would allow it to be classified as isosceles?
Although angles are not the focus right now, there is something cool about the angles of an isosceles triangle. What is it?
Don't forget to record your findings on your notes page.