# Definition:Orthogonal (Analytic Geometry)

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## Definition

### Orthogonal Curves

Two curves are **orthogonal** if they intersect at right angles.

The term perpendicular can also be used, but the latter term is usual when the intersecting lines are straight.

### Orthogonal Surfaces

Definition:Orthogonal Surfaces

## Also known as

Two objects that are **orthogonal** are often seen described as **perpendicular**.

However, the latter usually used where those objects are straight lines or planes.

## Also see

## Sources

- 1998: David Nelson:
*The Penguin Dictionary of Mathematics*(2nd ed.) ... (previous) ... (next):**orthogonal** - 2008: David Nelson:
*The Penguin Dictionary of Mathematics*(4th ed.) ... (previous) ... (next):**orthogonal**