# Geometry Symbols

### Mathematics Symbols

### Mathematics Terms

- See algebra, geometry, trigonometry

### Nomenclature & Symbols for Engineering, Mathematics, & Science

- See A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

### Postulates and theorems

- See geometry postulates
- See geometry theorems

## Geometry Symbols

This is a list of the most common Geometry symbols:

Symbol | Definition | Example |
---|---|---|

\(\triangle\) | triangle | \(\triangle ABC \) |

\(\bigcirc\) | circle | |

\(\odot A\) | circle with center A | |

\(\angle\) | angle | \(\angle ABC = 60^\circ\) |

\(\measuredangle\) | measured angle | \(\measuredangle ABC = 60^\circ\) |

\(\sphericalangle\) | spherical angle | \(\sphericalangle AOC = 60^\circ\) |

\(^\circ\) | degree | 1 circle \(= 360^\circ\) |

' | arcminute | \(1^\circ = 60^\prime\) |

" | arcsecond | \(1'=60^{\prime\prime}\) |

\(r \;or\; rad\) | radiant, \(1 \;rad = 180^\circ /\pi \;\) and \(\;1^\circ = \pi / 180 \;rads\) | \(360^\circ = 2\pi\; rad\) or about \(57.2958^\circ\) |

\(g \;or\; grad\) | gradian, four hundredth (1/400) of a full circle | \( 360^\circ = 400\; grad\) |

\(\overleftrightarrow {AB}\) | infinite line distance | |

\(\overline {AB}\) | line segment from endpoint A to B | |

\(\overrightarrow{AB}\) | start line at point A | |

\(\overset{\frown}{AB}\) | arc with endpoints A and B | |

\(\overset{\frown}{ABC}\) | arc with endpoints A and C | |

m\(\overset{\frown}{AB}\) | measure arc with endpoints A and B | |

\(|A-B|\) | distance between points A and B | \(|A-B| = 9\) |

\(\parallel\) | parallel to | \(\overline {AB} \parallel \overline {XY} \) |

\(\nparallel\) | not parallel to | \(\overline {AB} \nparallel \overline {XY} \) |

\(\perp\) | perpendicular lines | \(\overline {AB} \perp \overline {XY} \) |

\(\sim\) | similarity to | \(\triangle ABC \sim \triangle XYZ\) |

\(\cong\) | congruent, equivalent in size and shape | \(\triangle ABC \cong \triangle XYZ\) |

\(\ncong\) | is not congruent to | \(\triangle ABC \ncong \triangle XYZ\) |

\(\therefore\) | therefore | \( a=b\; \therefore\; b=a \) |

\(\pi\) | \(\pi = 3.141592654... \) | \(C = \pi \cdot d = 2 \cdot \pi \cdot r\) |