Category:Common Tangents

This category contains results about Common Tangents.
Definitions specific to this category can be found in Definitions/Common Tangents.

Let $C_1$ and $C_2$ be plane curves.

Let $\LL$ be a straight line which is tangent to both $C_1$ and $C_2$.

Then $\LL$ is a common tangent to $C_1$ and $C_2$.