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# Ed Measurements:Math

### basic math terms

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

Mean | the sum of n numbers divided by n |

median | the middle of a numerically arranged set of numbers |

mode | most frequently shown number |

range | difference between the greatest and the lowest numbers in a set |

supplementary angles | angles that add up to 180 degrees |

complementary angles | angles that add up to 90 degrees |

acute angles | an angle less than 90 degrees |

obtuse angle | an angle more than 90 degrees but less than 180 degrees |

straight angle | an angle that is 180 degrees |

reflex angle | an angle more than 180 degrees but less than 360 degrees |

right angle | an angle that is 90 degrees |

parallel lines | two lines that never cross |

perpendicular lines | two lines that intersect at a 90 degree angle |

scalene triangle | a triangle that has no equal angles and no equal sides |

isosceles triangle | a triangle that has two equal sides and two equal angles |

equilateral triangle | a triangle that has all equal sides and all equal angles |

polygon | simple closed curved shape with only segments as sides |

quadrilateral | a polygon with four sides |

perimeter | the distance around a figure |

circumference | the distance around a circle |

Created by:
christine_aley