# Are two angles in the same plane with a common vertex and a common side?

A | B |
---|---|

Adjacent angles | Two angles in the same plane with a common vertex and a common side, but no common interior points. |

Complementary angles | Two angles whose measures have a sum of 90°. |

Supplementary angles | Two angles whose measures have a sum of 180°. |

Moreover, are angles that have the same vertex and one side in common?

Adjacent **angles** are two **angles that have a common vertex and a common side** but do not overlap. In the figure, ∠**1** and ∠2 are adjacent **angles**. They share the **same vertex** and the **same common side**.

A | B |
---|---|

ray | part of a line that has one endpoint and extends forever in the other direction |

angle | when 2 rays share a common endpoint |

vertex | the endpoint of an angle, where the 2 rays meet |

degree | unit used to measure size of an angle |

Thereof, what is it called when two angles in a plane share a vertex and a side but no common interior points?

There are some special relationships between "pairs" of **angles**. Adjacent **Angles** are **two angles** that **share** a **common vertex**, a **common side**, and **no common interior points**. (They **share a vertex** and **side**, **but** do **not** overlap.) A Linear Pair is **two** adjacent **angles** whose non-**common sides** form opposite rays.

An angle is the union of **two rays with a common endpoint**. The **common endpoint** of the **rays** is **called the vertex** of the angle, and the **rays** themselves are **called** the sides of the angle.