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# Geometry Unit Vocab

### For Zoe; Tutoring Session

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

Acute Angle | An angle that measures less than 90 degrees |

Acute Triangle | A triangle that has all angels less than 90 degrees |

Adjacent Angles | Two angles that have a common vertex and don't overlap |

Decagon | A polygon with 10 sides |

Degree | A measure for angles. There are 360 degrees in a full rotation. The symbol for degrees is °. |

Endpoint | The two furthest points on a line segment |

Equilateral Triangle | A triangle with all three sides of equal length. All of the angles in it measure 60° |

Hexagon | A polygon with 6 sides |

Intersecting Lines | Lines that cross over and have a common point |

Isosceles Triangle | A triangle with two equal sides. The angles opposite of the equal sides are equal |

Line | Straight, has no thickness, and extends in both directions without end |

Line of Symmetry | A line where you could fold a shape and have both sides match exactly |

Line Segment | The part of a line that connects two points |

Obtuse Angle | More than 90° but less than 180° |

Obtuse Triangle | A triangle that has one angle greater than 90° |

Octagon | A polygon with 8 sides |

Parallel Lines | Lines that never meet. They are the same distance apart |

Parallelogram | A quadrilateral where opposite sides are parallel |

Pentagon | A polygon with 5 sides |

Perpendicular Lines | lines that are at right angle to each other |

Point | An exact location. It has no size, only location |

Protractor | A measuring tool used to measure or draw angles |

Quadrilateral | A two-dimensional shape with four straight sides |

Ray | A part of a line with a start point but no end point |

Rectangle | A two-dimensional shape with straight sides where all inside angles are right angles |

Rhombus | A two-dimensional shape with 4 straight sides that are all equal length. It's a type of parallelogram |

Right Angle | Equal to 90° and is one quarter of a full rotation |

Right Triangle | A triangle that has one right angle |

Scalene Triangle | A triangle with all sides of different lengths. No sides or angles are equal |

Square | A quadrilateral where all sides have equal length and every angle measures 90° |

Symmetry | When two or more parts are identical after a flip, slide, or turn |

Trapezoid | A quadrilateral that has one pair of opposite sides parallel |

Vertex | A point where two or more line segments meet. It can also be referred to as a corner |

Vertices | the plural form of vertex |