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# Math Vocab 6

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

protractor | a tool used to measure angles |

acute angle | an angle less than 90 degrees |

obtuse angle | an angle greater than 90 degrees |

straight angle | an angle that measures 180 degrees |

right angle | an angle equal to 90 degrees |

center | the point inside a circle that is the same distance from all the points on the circle |

chord | a segment whose endpoints lie on a circle |

diameter | the distance across a circle through its center |

radius | a line segment that has one endpoint on a circle and the other endpoint at the center of the circle |

scalene triangle | a triangle with no equal sides |

isosceles triangle | a triangle with two equal sides |

equilateral triangles | all sides of the triangle are equal in length |

acute triangle | a triangle with 3 acute angles |

obtuse triangle | a triangle with exactly one obtuse angle |

right triangle | a triangle with exactly one right angle, 90 degrees |

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

leg | the 2 sides of a triangle that form the right angle |

line | an infinite amount of points that extend forever in two directions (symbol has an arrow on both ends) |

line segment | a portion of a line that contains two endpoints (symbol is just a straight line) |

ray | a part of a line that begins at a point and extends in one direction without end (symbol has an arrow on one end) |

parallel lines | two lines that never intersect |

perpendicular lines | two lines that intersect to form four right angles |

Created by:
dcs