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# 7th Geometry

### Angles, Triangles

Question | Answer |
---|---|

Ray | A part of a line that has one fixed end point and extends infinitely along the line from the end point. |

Angle | A figure formed by two rays. |

Vertex | A point where two or more lines come together. |

Acute angle | An angle less than 90 degrees |

Right angle | An angle equal to 90 degrees |

Obtuse angle | An angle greater than 90 degrees but less than 180 degrees |

Straight angle | An angle that equals 180 degrees |

Supplementary angle | Two angles that total 180 degrees. |

Complementary angle | Two angles that total 90 degrees. |

Adjacent angles | Two angles that share the same vertex, but do not have any other relationship. |

Vertical angles | A pair of angles opposite intersection lines. Vertical angles are equal to each other. |

Equilateral triangle | A triangle that has ALL sides the same length |

Isosceles triangle | A triangle that has EXACTLY two sides equal. |

Scalene triangle | A triangle in which ALL sides are NOT the same |

Acute triangle | A triangle with all three angles that are less than 90 degrees |

Right triangle | A triangle with a 90 degree angle |

Obtuse triangle | A triangle that has one angle more than 90 degrees |