# Definition:Triangle (Geometry)/Opposite

< Definition:Triangle (Geometry)(Redirected from Definition:Opposite (in Triangle))

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## Definition

The side of a triangle which is *not* one of the sides adjacent to a particular vertex is referred to as its **opposite**.

Thus, each vertex has an opposite side, and each side has an opposite vertex.

## Sources

- 1998: David Nelson:
*The Penguin Dictionary of Mathematics*(2nd ed.) ... (previous) ... (next):**opposite**:**1.** - 2008: David Nelson:
*The Penguin Dictionary of Mathematics*(4th ed.) ... (previous) ... (next):**opposite**:**1.**