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# Geometry

### Topic8

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

Line | A straight path of points that goes on and on in both directions |

Intersecting lines | Lines that cross at one point |

Perpendicular lines | Two intersecting lines that form right angles |

Parallel lines | In a plane, lines that never intersect |

Point | An exact location in space |

Plane | An endless flat surface |

Angle | A figure formed by two rays that have the same endpoint |

Acute angle | An angle that is less than a right angle |

Obtuse angle | An angle that is greater than a right angle |

Right angle | An angle that forms a square corner |

Line segment | A part of a line that ends in two end points |

Ray | A part of a line that has one endpoint and continues endlessly in one direction. |

Straight angle | An angle that forms a straight line |

Pentagon | A polygon with five sides |

Hexagon | A polygon with six sides |

Quadrilateral | A polygon with four sides |

Polygon | A closed plane figure made up of line segments |

Triangle | A polygon with three sides |

Acute triangle | A triangle with three acute angles |

Vertex, plural vertices | The point where two rays meet. The point where the sides of a polygon meet. |

Isosceles triangle | A triangle with two equal sides |

Equilateral triangle | A triangle with three equal sides |

Right triangle | A triangle with one right angle |

Obtuse triangle | A triangle with one obtuse angle |

Parallelogram | A quadrilateral with two pairs of parallel sides |

Scalene triangle | A triangle where all the sides are different lengths |

Rhombus | A quadrilateral with two pairs of parallel sides, and all the sides the same length |

Radius | A line segment that connects the edge of a circle with the center |

Diameter | A line segment that connects two points on a circle an crosses the center |

Cube | A solid with six square faces |

Center | The middle of a circle |

Trapezoid | A quadrilateral with only one pair of parallel sides |

Created by:
heatherbaca