# Definition:Containment

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## Disambiguation

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**Containment** may refer to:

- Geometry
- Containment of an angle: The two lines that form an angle are said to
**contain**that angle. - Containment of a geometric figure: a figure is intuitively described as being
**contained**by its boundary. - Containment of a solid geometric figure: a solid figure is intuitively described as being
**contained**by the surfaces that form its boundary. - Containment of a rectangle: In Euclid's
*The Elements*, two adjacent sides of a rectangle are said to**contain**it.

- Containment of an angle: The two lines that form an angle are said to

- In set theory, the concept of
**containment**can be used in either of two senses:

- Consequent to this ambiguity, it is strongly advised that the term
**contain**is not used.

## Also see

- Definition:Jordan Curve, for a rigorous definition of the concept of
**containment**in the complex plane.