Definition/Meaning | Word/Phrase |
---|---|

triangle whose interior angles are all acute | acute-angled triangle , acute triangle |

woman's headscarf folded into a triangle and tied under the chine; worn by Russian peasant women | babushka |

function of an angle expressed as a ratio of the sides of right-angled triangle containing the angle | circular function , trigonometric function |

ratio of the adjacent side to the hypotenuse of a right-angled triangle | cos , cosine |

ratio of the hypotenuse to the opposite side of a right-angled triangle | cosec , cosecant |

ratio of the adjacent to the opposite side of a right-angled triangle | cotan , cotangent |

triangle with three equal sides | equilateral |

Greek mathematician and inventor who devised a way to determine the area of a triangle and who described various mechanical devices (first century) | Hero , Heron , Hero of Alexandria |

triangle opposite the right angle, side of | hypotenuse |

right-triangle side | hypotenuse |

right triangle's side opposite the right angle | hypotenuse |

side of a right triangle opposite the right angle | hypotenuse |

triangle with two equal sides | isosceles |

triangle with two equal sides | isosceles triangle |

Arab headdress consisting of a square piece of cloth folded into a triangle and fastened over the crown by an agal | kaffiyeh |

square scarf that is folded into a triangle and worn over the head or about the neck | kerchief |

triangle side | leg |

set of points such that for every pair of points there is a nonnegative real number called their distance that is symmetric and satisfies the triangle inequality | metric space |

triangle that contains no right angle | oblique triangle |

triangle that contains an obtuse interior angle | obtuse-angled triangle , obtuse triangle |

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