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# Angles

Term | Definition |
---|---|

Ray | A ray is a part of a line that begins at a particular point (called the endpoint) and extends endlessly in one direction. |

Angle | An Angle is the figure formed when two rays meet at a common endpoint. |

Central Angle | A Central Angle is an angle with its vertex at the center of a circle. |

Right Angle | A Right Angle is an angle that has a measure of 90 degrees. |

Straight Angle | A Straight Angle is an angle that has a measure of 180 degrees. |

Acute Angle | An Acute Angle is an angle that that has a measure of more than 0 degrees but less than 90 degrees. |

Obtuse Angle | An Obtuse Angle is an angle that that has a measure of more than 90 degrees but less than 180 degrees. |

Complementary Angles | Two Angles are Complementary if their measures add up to 90 degrees (a Right Angle). |

Supplementary Angles | Two Angles are Supplementary if their measures add up to 180 degrees (a Straight Angle). |

Congruent Angles | Two angles are Congruent if their measures are equal. |

Vertical Angles | Two angles are Vertical if they are formed by intersecting lines and are opposite each other. |

Parallel Lines | Parallel lines are two lines on a plane that never intersect and have the same slope. |

Transversal | A transversal is a line that crosses at least two other lines. |

Corresponding Angles | When two lines are intersected by a transversal, the angles that match from one group to the other are called corresponding angles. |

Alternate Interior Angles | When two lines are intersected by a transversal, the pairs of angles on opposite sides of the transversal but inside the two parallel lines are called Alternate Interior Angles. |

Alternate Exterior Angles | When two lines are intersected by a transversal, the pairs of angles on opposite sides of the transversal but outside the two parallel lines are called Alternate Interior Angles. |

Created by:
esisolak