Incenters of Triangles and Inscribing Circles
This applet demonstrates how the centriod of a triangle is constructed.
Move points A, B and C and notice what happens to the triangle. 1. What are the red lines on the triangle? How do you know? 2. What is point D called? 3. Constructing a circle inside triangle ABC is called what? 4. What are the radii of the circle? Do they ever change?