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Distance Between Two Parallel Lines
## Formula
For parallel lines:
$$Ax+By+C_1=0$$
and:
$$Ax+By+C_2=0$$
the distance between them is:
$$d=\frac{|C_1-C_2|}{\sqrt{A^2+B^2}}$$
## Usage
- Used to find the perpendicular distance between two parallel lines.
