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# chapter13

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

radical | square root written as a number under a radical sign |

irrational number | numbers with decimals that do not end and do not repeat |

radical equation | an equation that has a variable under a radical sign |

right triangle | a triangle with one right angle and two acute angles |

hypotenuse | the side across from the right angle of a right triangle |

Pythagorean theorem | a formula for finding the length of a side of a right triangle when you know the lengths of the other sides: a2 + b2 + c2 |

Pythagorean triple | three positive whole numbers that satisfy the pythagorean theorem: the numbers can be the measures of the sides of a right triangle. |

distance formula | a way to find the distance between two points using the Pythagorean theorem |

45*-45*-90* triangle | a right triangle whose acute angles both measure 45* |

30*-60*-90* triangle | a right triangle whose acute angles measure 30* and 60* |