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# 4th M Geometry Terms

### 4th Geometry Terms

Question | Answer |
---|---|

point | an exact location in space |

plane | an endless flat surface |

parallel | lines that never intersect (they don't cross) |

perpendicular lines | lines that form square corners where they cross |

intersecting lines | lines that pass through the same point |

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

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

right angle | an angle that forms a square corner ( it is exactly 90 degrees) |

acute angle | an angle that is open less than a right angle (it is less than 90 degrees) |

obtuse angle | an angle that is open more than a right angle but less than a straight angle (it is more than 90 degrees, but less than 180 degrees) |

straight angle | an angle that forms a straight line (it is exactly 180 degrees) |

degree | a unit measurement of angles |

protractor | a tool used to measure and draw angles |

vertex | the point where two rays meet to form an angle |

right triangle | a triangle that has one right angle |

acute triangle | a triangle that has 3 acute angles |

obtuse triangle | a triangle that has one obtuse angle |

parallelogram | a quadrilateral that has two pairs of parallel sides |

rectangle | a quadrilateral that has four right angles |

square | a quadrilateral that has four right angles and all four sides are the same length |

rhombus | a quadrilateral in which opposite sides are parallel and all of its sides are the same length |

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

polygon | a flat two-dimensional shape with straight sides that are fully closed, the sides must be straight NOT curved, they can have any number of sides |

line of symmetry | the line on which a figure can be folded so both halves are the same |