click below

click below

Normal Size Small Size show me how

# Geometry

### basic vocabulary words for supporting learners of geometry

Term | Definition |
---|---|

symmetry | when the object is the same on both sides of the line of symmetry |

congruent | exact same shape and size |

perimeter | the measurement of the outside of a shape |

area | the measure of the inside of a shape |

right angle | an angle with exactly 90 degrees |

obtuse angle | an angle that has more than 90 degrees |

acute angle | an angle that has less than 90 degrees |

perpendicular lines | two lines which cross at a 90 degree angle |

right triangle | a triangle with a right angle (90 degrees) |

isosceles triangle | a triangle with two equal sides and two equal angles |

equilateral triangle | a triangle with equal sides and equal angles |

vertex | the point where two lines come together |

face | the side of a 3D figure |

polygon | a closed figure made of line segments |

point | a single position in space |

line | goes on forever in both directions |

ray | has one endpoint and goes on forever in one direction |

quadrilateral | any 4-sided shape |

pentagon | a shape with 5 sides |

parallel lines | two lines which are the same distance apart but never touch |

parallelogram | a 4-sided shape with parallel lines |

intersecting lines | two lines which cross as one point |

trapezoid | a 4-sided shape with one pair of parallel lines |

scalene triangle | a triangle with no equal sides or angles |

rhombus | 4-sided polygon with 4 equal sides |

square | 4-sided polygon with equal sides and 4 right angles |

rectangle | 4-sided polygon with 4 right angles |

hexagon | a shape with 6 sides |

octagon | a shape with 8 sides |

protractor | a tool that measures angles |

adjacent angles | angles that share a vertex and have a common side |

complementary angles | two angles that measure up to 90' |

supplementary angles | two angles that measure up to 180' |

vertical angles | opposite angles created by intersecting lines |

linear pair | two angles that form a straight line |

equilateral | all equal sides of a shape |

equiangular | all equal angles of a shape |