# Angle and Line Symbols

### Mathematics Symbols

- See Algebra Symbols / Basic Math Symbols / Bracket Symbols / Equivalence Symbols / Geometry Symbols / Greek Alphabet / Miscellaneous Symbols / Roman Numerals / Set Symbols / Square Root Symbols

### Mathematics Terms

- See Algebra, Geometry, Trigonometry

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

## Angle and Line Symbols

This is a list of the most common angle and line symbols:

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

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

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

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

\(\sphericalangle\) | spherical angle | \(\angle ABC \;\sphericalangle\; 60^\circ\) |

\(c\) | radian | \(360^\circ=2\pi^c\) |

\(g\) | grad | \(360^\circ=400^g\) |

\(\circ\) | degree | \(360^\circ\) |

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

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

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

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

\(\overset{\frown} { }\) | arc from A to B | \(\overset{\frown} {AB}\) |

\(|\;\;|\) | distance between 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 | \(\overline {AB} \perp \overline {XY} \) |

\(\bigcirc\) | circle | |

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