Common Tangent Lines


Two Given Circles



Given two circles, show constructions for all of the common tangent lines.

A "common tangent line" for two circles would be a line that is simultaneously tangent to the two given circles.


There are four such common tangents:

Prepare a GSP file with script tools to implement the construction.

Click HERE for mine.

The GSP file script tools shows the end result. Can you use GSP to illustrated the steps leading to the construction?