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# Geo Vocab

### Geometry Vocaulary

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

line | a set of points that continue in both directions without end |

line segment | part of a line with two endpoints |

ray | part of a line that has one endpoint and continues in the other direction without end |

point | an exact location in space; has no size |

parallel lines | lines that never intersect |

intersecting lines | lines that cross |

perpendicular lines | lines that intersect at 90 degree angles |

angle | 2 rays with a common endpoint |

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

right angle | an angle that is exactly 90 degrees |

straight angle | an angle that measures 180 degrees |

360 degrees | the number of degrees in a circle |

obtuse angle | an angle that measures greater than 90 degrees but less than 180 degrees |

circle | a set of points that are equidistant (the same distance) from a common point called the center; named by its center point |

chord | a line segment in a circle with both endpoints on the circle |

diameter | a line segment in the circle with both endpoints on the circle, and it passes through the center |

radius (radii - plural) | a line segment in a circle with one endpoint on the circle and one endpoint on the center (1/2 the diameter) |

polygon | a closed figure made of line segments that do not intersect |

triangle | three-sided polygon |

obtuse triangle | triangle with 1 obtuse angles and 2 acute angles |

acute triangle | triangle with 3 acute angles |

right triangle | triangle with 1 right angle and 2 acute angles |

equilateral triangle | triangle with 3 congruent sides |

congruent | exact same size and shape |

scalene triangle | triangle with no congruent sides |

isosceles triangle | triangle with at least 2 congruent sides |

quadrilateral | four-sided polygon |

parallelogram | a quadrilateral with 2 pairs of parallel sides |

rhombus | a parallelogram with 4 congruent sides |

rectangle | a parallelogram with 4 right angles |

square | a parallelogram with 4 congruent sides and 4 right angles |

trapezoid | a quadrilateral with only one pair of parallel sides |

Created by:
dgiordano