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# Mrs. C's Geometry

### Geometry Definitions

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

Point | An exact position in space. |

Line | An infinite set of points forming a straight path extending in two directions. |

Line segment | A part of a line defined by two endpoints. |

Plane | A flat surface that extends infinitely in all directions. |

Parallel Planes | Two planes can be parallel to each other, when they are parallel they are in a line. |

Angle | Two rays that share an endpoint. |

Vertex | The point at which two line segments,lines, or rays meet to form an angle. |

Complementary Angles | Two angles what have measures with a sum of 90 degrees |

Supplementary Angles | Two angles that have measured to 180 degrees. |

Congruent Angles | When two angles have the same measurement of angles. |

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

Obtuse Angle | An angle with a measurement greater than 90 and less than 180 degrees. |

Right Angle | An angle that measures 90 degrees. |

Straight Angle | An angle that measures 180 degrees. |

Reflex Angle | An angle that measures more than 180 degrees. |

Circle | A closed curve with all of its points in one plane and the same distance from a fixed point. |

Radius | The segment or the length of a segment from the center of a circle to a point on the circle. |

Diameter | A chord that passes through the center of a circle and has endpoints on a circle. |

Chord | Any line segment that joins tow points on a circle. |

Arc | The part curved between any two of its points. |

Cicumference | The measure in a square units of the interior region of a 2D or 3D figure. |

Polygons | A closed figure formed from a line segments that meet on ly at their endpoints. |

Acute Triangle | Measures less than 90 degrees. |

Obtuse Triangle | Measures greater than 90 degrees |

Right Triangle | Measures 90 degrees. |

Scalene Triangle | All sides measure different |

Isosceles Triangle | 2 sides measure the same |

Equilateral Triangle | All sides have the same measurement |

Parallelogram | A quadrilateral with two pairs of parallel and congruent angles |

Square | Parallelogram with 4 congruent sides and angles that are 90 degrees. |

Recdtangle | A quadrilateral with two pairs of congruent parallel sides and four right angles |

Rhombus | A parallelogram where all 4 sides are equal in length. |

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

Pentagon | A polygon that has 5 sides |

Hexagon | A polygon that has 6 sides |

Octagon | A polygon that has 8 sides |

Ray | A part of a line with one end point and extends indefinitely in one direction |

Parallel Lines | Lines that always same the same distance apart and will never touch. |

Perpendicular LInes | Lines that intersect and form a right angle. |

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