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Circle Tangent to Two Parallel Lines
For parallel lines:
$$Ax+By+C_1=0$$
and:
$$Ax+By+C_2=0$$
a circle tangent to both has radius:
$$r=\frac{|C_1-C_2|}{2\sqrt{A^2+B^2}}$$
Usage
- Used to find the radius of a circle fitting exactly between two parallel lines.
