# Equations of a plane

- Author:
- Sebastian Williams

- Topic:
- Equations

The three points A, B and C define a plane in space.
The vectors AB and AC are two vectors that span the plane from the position vector of point A.
The vector AD is the

**normal**(perpendicular) to vectors AB and AC. Using the normal vector is another way to define a plane (see**g**). That is the**Cartesian equation**of a plane.## New Resources

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