# Geometry symbols

**Geometry:** The branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids, and higher dimensional analogues.

Symbol | Symbol Name | Meaning / definition | Example |
---|---|---|---|

∠ | angle | formed by two rays | ∠ABC = 30º |

measured angle | ABC = 30º | ||

spherical angle | AOB = 30º | ||

∟ | right angle | = 90º | α = 90º |

º | degree | 1 turn = 360º | α = 60º |

´ | arcminute | 1º = 60´ | α = 60º59′ |

´´ | arcsecond | 1´ = 60´´ | α = 60º59’59” |

line | infinite line | ||

AB | line segment | line from point A to point B | |

ray | line that start from point A | ||

arc | arc from point A to point B | = 60º | |

| | perpendicular | perpendicular lines (90º angle) | AC | BC |

|| | parallel | parallel lines | AB || CD |

≅ | congruent to | equivalence of geometric shapes and size | ∆ABC ≅ ∆XYZ |

~ | similarity | same shapes, not same size | ∆ABC ~ ∆XYZ |

Δ | triangle | triangle shape | ΔABC ≅ ΔBCD |

|x–y| |
distance | distance between points x and y | | x–y | = 5 |

π | pi constant | π = 3.141592654…is the ratio between the circumference and diameter of a circle |
c = π·d = 2·π·r |

rad | radians | radians angle unit | 360º = 2π rad |

grad | grads | grads angle unit | 360º = 400 grad |

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