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Condition for Perpendicular Lines in General Form
## Formula
For:
$$A_1x+B_1y+C_1=0$$
and:
$$A_2x+B_2y+C_2=0$$
the lines are perpendicular if:
$$A_1A_2+B_1B_2=0$$
## Usage
- Used to test whether two lines are perpendicular directly from their coefficients.
