acute triangle | | is a polygon with all sides congruent and all angles |

vertical angles | | an angle between 0 degrees and 90 degrees |

complementary | | when the sum of 2 angles = 90 degrees |

equilateral triangle | | when the sum of 2 angles are =180 degrees |

isosceles triangle | | a triangle with one 90 degree angle |

obtuse triangle | | a trapezoid with exactly one pair of parellel |

parallel lines | | has 4 congruent sides and 4 right angles |

parallelogram | | is a quadrilateral with both pairs of opposie sides parallel |

rectangle | | has 3 congruent sides |

congruent angles | | angles that are betweeen 90 and 180 degrees |

regular polygon | | has at least 2 congruent sides |

rhombus | | is a triangle with no equal sides |

right triangle | | formed by 2 intersecting lines & are opposite each other |

scalene triangle | | has 4 congruent sides |

square | | angles with = measures |

supplementary | | a four sides figure with 4 right angles |

trapazoid | | lines on the same plane and never intersect |