# Definition:Opposite

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## Disambiguation

This page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article.

**Opposite** may refer to:

- Geometry:
- Opposite (in a Polygon):
- Opposite (in a Triangle): The side of a triangle which is not one of the sides adjacent to a particular angle is referred to as its opposite. Thus, each angle has an opposite side, and each side has an opposite angle.
- Vertical angles are sometimes referred to as
**vertically opposite angles**.

- Solid geometry:
- Opposite face: In a parallelepiped, the face which is parallel to a given face is the opposite face to that face.

- Abstract Algebra:
- The opposite group to a group $\left({G, \circ}\right)$ is the group $\left({G, *}\right)$ defined such that $\forall a, b \in G: a \circ b = b * a$.
- Opposite Ring
- Opposite Algebra