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Centre of a Circle Tangent to Two Intersecting Lines
A circle tangent to two intersecting lines has its centre on one of their angle bisectors.
$$\frac{L_1}{\sqrt{A_1^2+B_1^2}}=\pm\frac{L_2}{\sqrt{A_2^2+B_2^2}}$$
Usage
- Used to find the locus of possible centres of circles tangent to two lines.
