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# 3rd Quarter Vocab..6

Question | Answer |
---|---|

Variable | a letter used to represent an unknown number The value can vary (change). |

x-axis | the horizontal axis on a coordinate grid |

y-axis | the vertical axis on a coordinate grid |

Origin | the point (0,0) where the x-axis and y-axis intersect (meet) |

Triangle | a polygon with 3 sides and 3 angles |

Quadrilateral | a polygon with 4 sides and 4 angles |

180 degrees | the sum of the angles in a triangle |

Acute angle | an angle that measures less than 90 degrees |

Obtuse angle | an angle that measures more than 90 degrees |

Scalene triangle | a triangle with no sides equal and no angles equal |

Isosceles triangle | a triangle with 2 sides equal and 2 angles equal |

Equilateral triangle | a triangle with all 3 sides and 3 angles equal |

Area | the number of square units needed to cover a region |

Volume | the number of cubic units needed to fill a space |

Mean | the average of a set of data (add, then divide) |

Median | the middle number in a set of data when the data is in order least to greatest |

Mode | the number that appears the most in a set of data |

Range | the difference between the highest and lowest number in a set of data (big - small) |

Right angle | an angle that measures exactly 90 degrees |

straight angle | an angle that measures exactly 180 degrees |