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# Geometry terms

### Vocab words on geometry

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

Geometry | The study of points lines angles surfaces and solids ? |

Point | A location in space represented by a dot? |

Line | A collection of points that extend forever in same direction? |

Line segment | A part of a line that has 2 end points ? |

Ray | A collection of points that begin at one point and extend forever ? |

Angle | 2 rays with the same end point ? |

Vertex | The point where 2 points meet? |

Plane | A flat surface that extends forever in all directions ? |

Parallel lines | Lines that are always same distance apart and will never cross each other? |

Intersecting lines | Lines that cross each other in the same spot ? |

Perpendicular lines | Intersecting lines that cross and make a right angle 90 degrees ? |

Acute angle | A angle less than 90 degrees ? |

Right angle | A perfect 90 degree angle ? |

Obtuse angle | A angle that is greater then 90 but less then 180 degrees ? |

Straight | A line that is flat 180 degrees? |

Reflex angel | A angle that is between 180 and 360 degrees ? |

Supplementary lines | 2 angles that equal to 180 degrees? |

Complementary lines | 2 angles that equal to 90 degrees |

Polygon | A closed plane figure with 3 or more sides triangle? |

Triangle | A polygon with 3 sides? |

Right triangle | A triangle with one 90 degree angle? |

Obtuse triangle | A triangle that has one angle that is bigger than 90? |

Acute triangle | All angles are less then 90 degrees |

Scalene triangle | A triangle with no equal sides? |

Isosceles triangle | A triangle with 2 equal sides ? |

Equilateral triangle | A triangle with all equal sides |

Quadrilateral | A polygon with 4 sides? |

Square | A polygon with 4 equal sides and 4 right angles? |

Rectangle | A 4 sided polygon with 4 right angles and 2 opposite angles are Equal? |

Rhombus | A polygon with 4 equal sides and opposite angles are equal? |

Parallelogram | A 4 sided polygon with 2 equal and parallel sides? |

Trapezoid | A 4 sided polygon with one pair of parallel sides and one pair of Sides that are not parallel ? |

Area | Number of square units needed to cover a region |

Perimeter | The add up,of all sides around a shape |

Area of square | Base x height |

Area of rectangle | B x h |

Area of triangle | 1/2 x b x h |

Area of Parallelogram | A = b x h |

Area of trapezoid | 1/2 x h ( b1 + b2 ) |

Altitude | Another word for height |

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