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# CPM Yr 1, Ch 4 Vocab

### Chapter 4 - Mrs. Poppington Sees The World vocabulary

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

An angle with measure greater than 0 degrees and less than 90 degrees. | acute angle |

An angle that measures 90 degrees. | right angle |

An angle with measure greater than 90 degrees and less than 180 degrees. | obtuse angle |

The opposite angles where two lines meet. | vertical angles |

A triangle in which all three angle measures are less than 180 degrees. | acute triangle |

A triangle in which one angle is a right angle. | right triangle |

A triangle with an obtuse angle. | obtuse triangle |

A triangle with no equal side lengths. | scalene triangle |

A triangle with two or more sides of equal length. | isoceles triangle |

A triangle with all side lengths equal. | equilateral triangle |

A quadrilateral with one pair of parallel sides. | trapezoid |

A quadrilateral with both pairs of opposite sides parallel. | parallelogram |

A quadrilateral with four right angles. | rectangle |

A quadrilateral with all four sides of equal length. | rhombus |

A special rectangle with all sides of equal length. | square |

A two-dimensional closed figure of straight line segments connected end to end. | polygon |

A polygon in which all side lengths are equal and all angle measures are equal. | regular polygon |

A polygon with four sides. | quadrilateral |

A polygon with five sides. | pentagon |

A polygon with six sides. | hexagon |

A polygon with eight sides. | octagon |

The point where two consecutive sides of a polygon meet. | vertex |

A line segment that connects two vertices of a polygon and is not a side. | diagonal |

A set of points at a fixed distance (radius) from a point (center). | circle |

Two straight lines on a two-dimensional plane that do not intersect no matter how far they are extended. | parallel lines |

Two lines on flat surface which make a right angle when they meet. | perpendicular lines |

The part of a line between two points. | line segment |

Part of a line that starts at a point on the line and contains all the points on the line that are on one side of the starting point. | ray |

A special side of a polygon used to compute area. | base |

In a triangle, parallelogram, or trapezoid, the perpendicular distance from a vertex to the line containing the "opposite" side (possibly extended). | height |

Created by:
CLHenry