GoGeometry Action 70!
- Author:
- Tim Brzezinski
- Topic:
- Angles, Circle, Tangent Line or Tangent
Creation of this applet was inspired by a tweet from Antonio Gutierrez (GoGeometry.)
Shown in this diagram are 2 circles, a common internal tangent, and a common external tangent.
You can adjust the size of the green circle by using the green slider.
How can we formally prove what this applet informally illustrates?