scaling | Coordinate Transform |

| 3D Scaling with Homogeneous Coordinates |

semiperimeter | Tangential Quadrilateral |

side length | Regular Polygon |

side of a triangle | Half Angle Relations in a Triangle |

| Relations between Angles and Sides in Triangles |

sides | Properties of Arbitrary Triangles |

sides of a triangle | Triangle - General Definitions |

similar triangles | Congruent and Similar Triangles |

| Congruence Transformation |

Simpsons rule | General Rules for 3D Solids |

sin | Properties of a Right Triangle |

skew quadrilateral | Quadrilateral - General Definitions |

solids | General Rules for 3D Solids |

sperical coordinate system | Conversion between 3D Coordinate Systems |

sphere | Sphere |

spherical coordinate system | Spherical Coordinate System |

square | Rectangle and Square |

sum of angles | Relations between Angles and Sides in Triangles |

| Regular Polygon |

surface of revolution | General Rules for 3D Solids |