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# Geometry revision

### Geometry Revision: terms & definitions

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

vertex | the point where 2 rays meet |

right angle | measures 90 exactly |

obtuse angle | measures more than 90 degrees, less than 180 |

acute angle | measures less than 90 |

straight angle | measures 180 |

A line has | 180 degrees |

congruent | is identical in size and shape |

adjacent angles | are next to each other, share a common side and the same vertex |

complementary angles | 2 or more angles that add up to 90 |

supplementary angles | 2 or more angles that add up to 180 |

revolution | a full circle, 360 degrees |

a triangle's internal angles | equals 180 degress |

right angle triangle | has a right angle |

a right angle is shown by | a square in the vertex |

acute triangle | are when all angles are less than 90 |

obtuse angle | has an angle that measures more than 90 |

scalene triangle | has no sides or angles the same |

isosceles triangle | has 2 sides and angles the same |

equilateral triangle | has all sides and angles the same |

when naming an angle | the vertex point is in the middle |

in <GMK | M is the vertex ( or corner) |

in <MGK | G is the vertex ( or corner) |

in a right angle triangle the hypotenuse | is the longest side and is opposite the right angle |

vertically opposite angles are | always equal/the same size |

pentagon | 5 sided |

quadrilateral | 4 sided |

bisect | cut in half or cross |

vertical | travels up and down |

horizontal | travels across |

pythagoras theory | axa + bxb = cxc |

Created by:
nicolenixon