91- 6303239042
Equation of a Line Through a Point with Given Normal
## Formula
For a point $$(x_1,y_1)$$ and normal direction $$(\cos\alpha,\sin\alpha)$$:
$$\left(x-x_1\right)\cos\alpha+\left(y-y_1\right)\sin\alpha=0$$
## Usage
- Used to construct a line whose normal direction is known.
