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# Geometry Terms

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

angle | a shape formed by two rays that share the same endpoint |

closed shape | a two-dimensional shape that begins and ends at the same point |

line | a straight path extending in both directions with no endpoints |

open shape | a shape that does not begin and end at the same point |

plane shape | a shape on a flat surface that is formed by curves, lines segments, or both |

point | an exact position or location |

polygon | a closed plane shape with straight sides |

ray | a part of a line, with one endpoint, that is straight and continues in one direction |

right angle | an angle that forms a square corner |

two-dimensional shape | plane shapes that have length and width. |

acute angle | an angle less than a right angle |

obtuse angle | an angle greater than a right angle |

quadrilateral | a 4 sided shape |

pentagon | a 5 sided shape |

hexagon | a 6 sided shape |

octagon | an 8 sided shape |

decagon | a 10 sided shape |

intersecting lines | lines that cross or meet and form angles |

perpendicular lines | lines that cross or meet to form RIGHT angles |

parallel lines | lines that NEVER cross and will not form any angles |

rectangle | a 4 sided shape with 2 pairs of sides that are the same length and 4 right angles |

square | 4 sides that are the same length and 4 right angles. |

rhombus | 2 pairs of opposite sides that are parallel and 4 sides that are of equal length. |

trapezoid | exactly 1 pair of opposite sides that are parallel. |

congruent | being the same size and shape |

right triangle | a triangle that has one right angle |

acute triangle | a triangle that has all acute angles |

obtuse triangle | a triangle that has one obtuse angle |

parallelogram | a quadrilateral with 2 sets of parallel sides. opposite sides are congruent. |

Created by:
ricew