Plane
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A plane is a flat surface defined by three points. A plane has limitless area. Three non-collinear points determine a plane.
Mathematically, a plane takes the form Ax + By + Cz = Ax0 + By0 + Cz0, where the point (x0, y0, z0) is in the plane, and the three-dimensional vector <A, B, C> is normal (also orthogonal or perpendicular) to the plane.
When the principle of a plane is extended into higher dimensions, it is known as a hyperplane.