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Dot Product Condition for Perpendicular Lines
## Formula
If direction vectors are:
$$\vec d_1=(a_1,b_1),\quad\vec d_2=(a_2,b_2)$$
then perpendicularity requires:
$$a_1a_2+b_1b_2=0$$
## Usage
- Used to test perpendicularity using direction vectors.
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Dot Product Condition for Perpendicular Lines
## Formula
If direction vectors are:
$$\vec d_1=(a_1,b_1),\quad\vec d_2=(a_2,b_2)$$
then perpendicularity requires:
$$a_1a_2+b_1b_2=0$$
## Usage
- Used to test perpendicularity using direction vectors.
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