Perimeter | | A triangle with at least two congruent sides. |

Legs | | A number from 0 to 1 that indicates how likely an event is to occur. |

Base Angles | | The distance d 2r of the circle. |

Apothem | | The angle opposite the base. |

Diameter | | The angles whose vertices are the endpoints of the base. |

Area | | Divide the circle into eight c ongruent pie-shaped parts. |

Probability | | If they have no points in commmon (except for boundary points). |

Quadrature | | The measure fo each angle of an equilateral triangle is 60 degrees. |

Radius | | The distance around a circle. |

Corollary | | The same distance from a given point on a plane. |

Non-Overlapping | | The set of all points in a plane that are the same distance, r, from a given point in the plane. |

Sectors | | Each altitude of a triangle from the center of the polygon to a side of the ploygon. |

Center | | The permeter of a closed plane figure is the distance around the figure. |

Isosceles Triangle | | The two congruent sides. |

Vertex Angle | | The distance of r of the circle. |

Circumferece | | The area of a closed plane figure is the number of non-overlapping squares of a given size that will exactly cover the interior of the figure. |

Circle | | The area of an enclosed region on a plane can be approximated by the sum of the areas of a number of rectangles. |