In this vector lesson, we’ll look at perpendicular distance between a point and a line or plane.
Perpendicular distance between a point and a line
![Diagram showing the perpendicular distance from a point to a line in vectors for math.](https://emilylearning.com/wp-content/uploads/2023/08/image-109.png)
To find the distance between a point, we first need to find a point on the line e.g. A. Once A is found, find vector AP, and the perpendicular distance from P to the line is taken to be :
![formula to find the perpendicular distance from a point to a line in vectors for math.](https://emilylearning.com/wp-content/uploads/2023/08/image-110.png)
where b is the direction vector of line l, (or any vector that is parallel to the line l).
Perpendicular distance between a point and a plane.
![Diagram showing the perpendicular distance from a point to a plane in vectors.](https://emilylearning.com/wp-content/uploads/2023/08/image-112.png)
To find the perpendicular distance between a point and a plane, we first need to find a point on the plane e.g. A. Once A is found, find vector AP, and the perpendicular distance from P to the plane is taken to be :
![formula to find the perpendicular distance from a point to a plane in vectors for math.](https://emilylearning.com/wp-content/uploads/2023/08/image-113.png)
Notes on H2 Math Vectors
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All the notes for H2 A Level Math
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