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# Chapter 4 Math

### Defenitions

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

triangle | a polygon with three sides |

scalene | No congruent sides |

isosceles | At least 2 congruent sides |

equilateral | 3 congruent sides |

acute | 3 acute angles |

right | 1 right angle |

obtuse | 1 obtuse angle |

equilangular | 3 congruent angles |

interior angles | The original angles |

exterior angles | The angles that form linear pairs with the interior angles |

corollary to a theorem | a statement that can be proved easily using the theorem. The corollary below follows from the Triangle Sum Theorem |

congruent figures | Two geometric figures are congruent if they have exactly the same size and shape. |

corresponding parts | all the parts of one figure are congruent to the corresponding parts of the other figure |

right triangle | 1 right angle |

legs | In a right triangle, the sides adjacent to the right angle are called the legs |

hypotenuse | The side opposite the right angle is called the hypotenuse of the right triangle |

flow proof | A flow proof uses arrows to show the flow of a logical argument |

isosceles triangle | At least 2 congruent sides |

legs | When an isosceles triangle has exactly two congruent sides, these two sides are the legs |

vertex angle | The angle formed by the legs |

base | The third side is the base of the isosceles triangle. |

base angles | The two angles adjacent to the base |

transformation | an operation that moves or changes a geometric figure in some way to produce a new figure. |

image | The new figure is called the image |

congruence transformation | A congruence transformation changes the position of the figure without changing its size or shape. |

translation | A translation moves every point of a figure the same distance in the same direction |

reflection | A reflection uses a line of reflection to create a mirror image of the original figure |

rotation | A rotation turns a figure about a fixed point, called the center of rotation |

Created by:
NuttyBaseball