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# Solid Math Vocab

### These vocabulary words accompany chapter 8 of Addison Wesley Grade 3

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

edge | a line segment where two edges meet |

face | each flat surface of a solid figure |

corner | where three or more edges meet |

vertex | where three or more edges meet |

vertices | plural of vertex |

point | an exact position |

line | a set of points that is endless in both directions |

line segment | part of a line that has two endpoints |

ray | part of a line that is endless in one direction. It has only one end point |

intersecting lines | lines that cross at one point |

parallel lines | lines that never cross |

angle | made by two rays that have the same endpoint. The endpoint is the vertex of the angle. |

right angle | makes a square corner, is also called a ninety degree angle |

acute angle | less than a right angle, less than a ninety degree angle |

obtuse angle | greater than a right angle, greater than a ninety degree angle. |

perpendicular lines | line segments or rays that form right angles |

polygon | a closed figure made of straight line segments |

triangle | a polygon with three sides |

quadrilateral | a polygon with four sides |

pentagon | a polygon with five sides |

hexagon | a polygon with six sides |

octagon | a polygon with eight sides |

equilateral triangle | all sides of the triangle are the same length |

isosceles triangle | at least two sides of this triangle are the same length |

scalene triangle | no sides of this triangle are the same length |

right triangle | one angle of this triangle is a right angle |

obtuse triangle | one angle of this triangle is obtuse |

rectangle | a polygon with four right angles - the opposites sides are the same length |

parallelogram | the opposite sides of this polygon are parallel and the same length |

square | this polygon has four right angles and all the sides are the same length |

rhombus | the opposite sides of this polygon are parallel and all sides are the same length |

trapezoid | this polygon has only one pair of parallel sides |

symmetric | when two halves of a figure match |

line of symmetry | the central fold line in a figure |

perimeter | the distance around a figure, add the lengths of all sides. |

area | the number of square units needed to cover the region inside of a figure |

square unit | a square with sides that are each one unit long |

volume | the number of cubic units needed to fill a solid figure |

cubic unit | a cube with edges that are one unit long |

Created by:
angiebriotta@gmail.c