acute angle |
an angle of less than ninety degrees. |

angle iron |
a piece of rolled iron or steel in the form of a right angle along its lengthwise dimension, used in construction for joining parts or as support. |

angle of incidence |
the angle that the line of movement of a body or of radiation, meeting a surface, makes with a line that is at right angles to the surface at the point of meeting. |

angle of repose |
the greatest angle of incline at which sand, stones, soil, or the like will not slide or roll downhill. |

at an angle |
slanted up or down; crooked. |

exterior angle |
any of the four angles formed outside of two parallel lines where they are intersected by a transverse line. (Cf. interior angle.) [2 definitions] |

interior angle |
any of the angles formed by a line that intersects two parallel lines. [2 definitions] |

oblique angle |
an angle that is not a right angle. |

obtuse angle |
an angle greater than 90 degrees and less than 180 degrees. |

right angle |
the angle formed where two perpendicular lines meet. It measures ninety degrees. |

solid angle |
an angle formed by three or more planes intersecting in a common point, or formed at the peak of a cone. |

straight angle |
an angle of 180 degrees. |

supplementary angle |
one of two angles that equal 180 degrees when added together. |

wide-angle lens |
a camera lens that covers an angle of view of forty-five degrees or more. |