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# Vocabulary Chapter 8

### Math Vocabulary Chapter 8 Flashcards

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

Vertex | The point where the two rays meet |

Right Angle | Exactly 90 degrees |

Acute Angle | Less than 90 degrees |

Obtuse Angle | Greater than 90 degrees |

Straight | Exactly 180 degrees |

Vertical Angle | Opposite angles formed by the intersection of two lines |

Congruent | Have the same measure |

Adjacent Angle | They share a common vertex, a common side, and do not overlap |

Prism | Three dimensional figure with at least two parallel faces |

Bases | Congruent faces that are polygons |

Pyramid | A three dimensional figure with one base that is a polygon |

Plane | A flat surface that goes on forever in all direction |

Coplanar | They lie in the same plane |

Parallel | They will never intersect |

Polyhedron | A three dimensional figure with flat surface that are polygons |

Edge | Two planes intersect in a line |

Face | A flat surface |

Vertex | Where three or more planes intersect at a point |

Diagonal | A line segment whose endpoints are vertices that are neither adjacent nor on the same face |

Cylinder | A three dimensional figure with two parallel congruent circular bases connected by a curved surface |

Cone | On circular base connected by a curved side to a single vertex |

Cross Section | The intersection of a solid and plane of the solid |

Supplementary Angles | If the sum of their measures is 180 degrees |

Complementary Angles | If the sum of their measures is 90 degrees |

Acute Triangle | All acute side |

Right triangle | 1 right triangle |

Obtuse Triangle | 1 obtuse angle |

Scalene Triangle | No congruent sides |

Isosceles Triangle | At least 2 congruent sides |

Equilateral Triangle | 3 congruent sides |

Triangle | A figure with three sides and three angles |

Congruent Segments | Sides with the same length |

Scale model | Model used to represent objects that are too large or too small to be built at actual size |

Created by:
vanne0112