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# Chapter 8 Vocabulary

### Anles, lines, triangles

Vocabulary | Answers |
---|---|

Point | a bold dot |

Line | keeps going without in two opposite directions. |

Angle | formed by two rays with the same end point |

Ray | has on end with a point and the other keeps going in one direction. |

Plane | a flat surface that extends without end in all directions. |

Vertex | The end point of two lines |

Straight angle | measures 180° |

Right angle | measures 90° and has a little box |

Supplementary | if the sum of theirs measures 180° |

Complementary | The sum of theirs measures 90° |

Vertical angle | there pairs are called vertical angles, and they always have the same measure. OPPOSITE PAIRS |

Paralled Lines | two lines that do not intersect. SAME PLANE |

Perpendicular lines | two lines that intersect at a right angle. |

Corresponding angles | angles that occupliy corresponging positions when a line intersects with two other lines |

alternate interior angles | insider angles |

alternate exterior angle | outside angles |

Quadrilateral | a closed figure with four sides that are line segments |

Trapezoid | quadrilateral with exactly one pair of parallel sides |

Parallelogram | quadrilateral with both pairs of opposite sides parallel. |

Rhombus | parallelogram with 4 sides of equal length. |

Rectangle | parallelogram with 4 right angles |

Square | parallelogram with 4 sides of equal lenth and 4 right angles. |

Acute angle | measure is less then 90° |

Right angle | measure is exactly 90° |

obtuse angle | measure is greater then 90° and less then 180° |

acute triangle | has 3 acute angles |

Right Triangle | has one right angle |

Obtuse Triangle | has on obtuse angle |

Equilateral Triangle | has 3 sides of equal lenth |

isosceles Triangle | has 2 of the same side lengths |

Scale Triangle | has NO sides of the same length. |

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