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# Unit 4 (math)

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

a part of line that has one endpoint and extends without end in one direction | ray |

a figure formed by two rays or line segments with a common endpoint | angle |

a straight path that goes on forever in opposite directions | line |

lines, line segments, or rays are perpendicular if they form right angles | perpendicular |

the same distance apart at every point | parallel |

lines that are not parallel or perpendicular | oblique |

to cut or divide by passing through or across | intersect |

a tool used to measure angles | protractor |

a unit for measuring angles. also a unit for measuring temperature | degree |

an angle that measures 90 degrees | right angle |

an angle of 180 degrees | straight angle |

angles having a sum of 180 degrees | supplementary angles |

angles having a sum of 90 degrees | complementary angles |

when two lines intersect, the angles formed are these | opposite angles |

pairs of opposite angles formed by intersecting lines | vertical angles |

a closed plane figure with sides made of straight line segments | polygon |

exactly the same size and shape | congruent |

a triangle with at least two congruent sides | isosceles triangle |

having all equal sides | equalateral |

a triangle with no equal sides | scalene triangle |

a triangle with three acute angles | acute triangle |

a triangle with one obtuse angle | obtuse triangle |

a triangle with one right angle | right triangle |

a trapezoid with at leas one right angle | right trapezoid |

a plane figure that forms a closed path so that all the points on the path are the same difference from a point called the center | circle |

an angle greater than 180 degrees | reflex angle |

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000194151