A | B |

Congruent | Having the same size and shape |

Legs of an isosceles triangle | The two sides of an isosceles triangle that have the same measure |

Base of an isosceles triangle | The side that is not one of the legs of an isosceles triangle |

Equiangular | All angles have the same measure |

Included angle | An angle formed by two of the sides of a triangle |

Included side | The vertices of two angles of a triangle are the endpoints of the side. |

SAS | Means Side, included angle, Side |

Flow proof | A type of proof that uses arrows |

Two column proof | A type of proof that is written in table form |

Paragraph proof | A type of proof that is written in sentences. |