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# 4.1

### Geometry Notecards

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

Triangle | A polygon with three sides. |

Scalene Triangle | A triangle with no congruent sides. |

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

Equilateral Triangle | A triangle with three congruent sides. |

Acute Triangle | A triangle with three acute angles. |

Right Triangle | A triangle with one right angle. |

Obtuse Triangle | A triangle with one obtuse angle. |

Equiangular Triangle | A triangle with three congruent angles. |

Interior Angles | The angles on the inside of a shape. When the sides of a polygon are extended, the original angles are the interior angles. |

Exterior Angles | When the sides of a polygon are extended, the angles that form linear pairs with the interior angles are the exterior angles. |

Triangle Sum Theorem | The sum of the measures of the interior angles of a triangle equal 180 degrees. |

Exterior Angle Theorem | The measure of an exterior angle of a triangle, is equal to the sum of the measures of the two non adjacent interior angles. |

Corollary to a Theorem | A statement that can be proved easily by using the theorem. |

Corollary to the Triangle Sum Theorem | The acute angles of a right triangle are complementary. |

Created by:
GBrown99