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# math unit 4

### math

ray | apart of a line that are end point and extends without end in one direction |

angle- | a figure formed by two rays or line segments with a common end point |

line- | straight line that goes on forever in one direction |

perpendicular lines, | line segments, or rays that are perpendicular if they are formed right anlges |

parallel | the same distance apart at ever point |

oblique line | lines that are not parallel or perpendicular |

intersect | to cut or divie by passing though or across |

protracter | a tool that measures angles |

degree | a unit for measuring angles also mearues tempreture |

right angle | an angle that measures 90 degrees |

straight angle | an angle having 180 degrees |

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

congruent- | same size same shape |

isosceles triangle- | a triangle with at least 2 congruent sides |

equilateral triangle- | having all equal sides |

scalene triangle- | a triangle with no equal sides |

acute triangle- | a triangle with at least 1 acute angle |

obtuse triangle- | an triangle with at least one obtuse angle. |

right triangle- | a triangle with at least one right angle |

right trapezoid- | a trapizoid with at least one right angle |

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

reflex angle- | an angle greater than 180 degrees |

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