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# Geometry Terms

### Geometry Terms for 5th grade

Term | Meaning |
---|---|

obtuse angle | angle that is greater than 90 degrees and less than 180 degrees |

acute angle | angle less than 90 degrees but greater than 0. |

straight angle | angle that is 180 degrees |

congruent | figure that has the same size and shape |

line segment | part of a line drawing having two end points |

point | exact location in space |

ray | part of a line that has one end point and extends forever in only one direction |

line | a set of points that goes on forever in two directions |

plane | an endless flat surface |

parallel line | in a plane, lines that never cross and are the same distance apart. |

intersecting lines | lines that pass through the same point |

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

turn | the change in the position of a figure that moves around a point. |

prism | a solid figure with two congruent parallel bases and faces that are parallelograms |

base | The face of a solid that is used to name a solid. |

cube | A solid figure with all faces are squares |

face | A flat surface of a polyhedron |

transformation | A move such as a slide, flip, or turn that does not change the size or shape of a figure |

angle | two rays that have the same end point |

vertex | the common endpoint of an angle |

sides | the two rays that form the angle |

right angle | An angle whose measure is 90 degrees |

protractor | An instrument used to measure and draw angles. |

similar | figures that have the same shape. They may or may not be the same size. |

sphere | A solid figure with all points the same distance from center point |

cylinders | solid with two circular bases that are congruent and parallel |

cone | a solid with one circular base |

chord | A line segment that connects two points on a circle |

slide | The change in position of a figure that moves it up, down, or sideways |

triangle | a polygon with 3 sides |

quadrilateral | a polygon with 4 sides |

pentagon | a polygon with 5 sides |

hexagon | a polygon with six sides |

octagon | a polygon with 8 sides |

right triangle | a triangle with one right angle |

acute triangle | a triangle with 3 acute angles |

obtuse triangle | a triangle with 1 obtuse angle. |

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

edge | a line segment where two faces meet. |

rectangle | a parallelogram with four right angles |

pyramid | a solid figure with all faces being triangles. |

radius | Any line segment that connects the center of a circle to a point on a circle. |

flip | The change in the position of a figure that gives the mirror image of the figure. |

equilateral triangle | a triangle whose sides all have the same length. |

isosceles triangle | a triangle with two sides the same length |

scalene triangle | a triangle with no sides having equal lengths |

parallelogram | a quadrilateral with both pairs of opposite sides being parallel |

rhombus | a parallelogram with all sides the same length |

trapezoid | a quadrilateral that has exactly one pair of parallel sides |

diameter | any line segment that goes through the center of a circle and both endpoints are on the circle. |

Created by:
John Weidner
on 2007-07-10