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In geometry, the **perpendicular distance** between two objects is the distance from one to the other, measured along a line that is perpendicular to one or both.

Particular instances include:

*Distance from a point to a line*, for the perpendicular distance from a point to a line in two-dimensional space*Point on plane closest to origin*, for the perpendicular distance from the origin to a plane in three-dimensional space*Distance from a point to a plane*, for the perpendicular distance from an arbitrary point to a plane in three-dimensional space*Nearest distance between skew lines*, for the perpendicular distance between two non-parallel lines in three-dimensional space

Curve fitting and line fitting methods may use perpendicular distance to measure the quality of a fit, as in Deming regression and total least squares.

A *normal distance* between a point and a curve or a surface may also be defined.

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