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# Math 6 Ch 9 Vocab

### Chapter 9 Vocabulary

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

acute angle | an angle with a measure greater than 0 degrees and less than 90 degrees |

acute triangle | a triangle having three acute angles |

complementary angles | two angles are complementary if the sum of their measures is 90 degrees |

congruent angles | angles with the same measure |

congruent figures | figures that are the same shape and size |

congruent segments | line segments that have the same length |

corresponding sides | the parts of congruent or similar figures that match |

degree | the most common unit of measure for angles |

equilateral triangle | a triangle having all three sides congruent and all three angles congruent |

isosceles triangle | a triangle in which at least two sides are congruent |

line segment | a straight path between two endpoints |

obtuse angle | a triangle having one obtuse angle |

obtuse triangle | a triangle having one obtuse angle |

parallelogram | a quadrilateral that has both pairs of opposite sides congruent and parallel |

quadrilateral | a polygon with four sides |

rectangle | a quadrilateral with opposite sides congruent and parallel and all angles are right angles |

rhombus | a parallelogram with all sides congruent |

right angle | an angle that measures 90 degrees |

right triangle | a triangle having one right angle |

scalene triangle | a triangle in which no sides are congruent |

side | a ray that is part of an angle |

similar figures | figures that have the same shape but different sizes |

square | a parallelogram with all sides congruent, all angles right angles, and opposite sides parallel |

straight angle | an angle that measures exactly 180 degrees |

supplementary angles | two angles are supplementary if the sum of their measures is 180 degrees |

tessellation | a pattern formed by repeating figures that fit together without gaps or overlaps |

trapezoid | a quadrilateral with one pair of opposite sides parallel |

vertex | the common endpoint of the two rays that form an angle |

vertical angles | nonadjacent angles formed by a pair of lines that intersect |

Created by:
mquay