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# Math Vocabulary List

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

Acute Angle | An angle with a measure greater than 0 and less than 90. |

Acute Triangle | A triangle having three acute angles. |

Adjacent Angles | Angles that have the same vertex,share a common side and don't overlap. |

Base | In a power, the number used as a factor. |

Complementary Angles | Two angles are complementary if the sum of their measure is 90. |

Congruent | Having the same measure. |

Cross Section | The cross section of a solid and a plane. |

Edge | The line segment where two faces of a polyhedron intersect. |

Equilateral Triangle | A triangle having three congruent sides. |

Face | A flat surface of a polyhedron. |

Isosceles Triangle | A triangle having at least two congruent sides. |

Obtuse Angle | Any angle that measures greater than 90 less than 180. |

Obtuse Triangle | A triangle having one obtuse angle. |

Polyhedron | A three-dimensional figure with faces that are polygons. |

Prism | A polyhedron with two parallel congruent faces called bases. |

Pyrimid | A polyhedron with one base that is a polygon and three or more triangular faces that meet at a common vertex. |

Right Angle | An angle that measures exactly 90. |

Right Triangle | A triangle having one right angle. |

Scalene Triangle | A triangle having no congruent sides. |

Straight Angle | An angle that measures exactly 180. |

Supplementary Angles | Two angles are supplementary if their sum measures 180. |

Triangle | A figure with three sides and three angles. |

Vertex | A vertex of an angle is the common endpoint of the rays forming the angle. |

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

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