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# geometry math terms

### terms used for topic 9 envision math book

question | answer |
---|---|

a two dimensional surface made up of points | plane |

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

an exact location in a space | point |

lines that never intersect | parallel lines |

lines that pass through the same point | intersecting lines |

lines that form square corners | perpendicular lines |

a part of a line with two endpoints | line segment |

is a part of a line that has one endpoint and continues on forever in one direction | ray |

a figure formed by two rays that have the same endpoint | angle |

is a square corner | right angle |

is less than a right angle | acute angle |

is greater than a right angle | obtuse angle |

forms a straight line | straight angle |

is a closed plane figure made up of line segments. | polygon |

the point where two sides meet | vertex |

3 sided polygon | triangle |

5 sided polygon | pentagon |

4 sided polygon | quadrilateral |

8 sided polygon | octagon |

triangle with 3 equal sides | equilateral triangle |

triangle with 2 equal sides | isosceles triangle |

triangle with 0 equal sides | scalene triangle |

triangle has one right angle | right triangle |

triangle has three acute angles | acute triangle |

triangle has one obtuse angle | obtuse triangle |

a quadrilateral that has opposite sides that are parallel and all of its sides are the same length. | rhombus |

a quadrilateral with only one par of parallel sides. | trapezoid |

q quadrilateral that has 2 pairs of parallel sides. | a parallelogram |

A quadrilateral that has 4 right angles. It is also a parallelogram. | a rectangle |

A quadrilateral that has 4 right angles and all sides are the same length. It is also a parallelogram, rectangle, and rhombus. | a square |

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