Angle and Line Symbols

Written by Jerry Ratzlaff on . Posted in Nomenclature & Symbols for Engineering, Mathematics, and Science

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Angle and Line Symbols

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

SymbolDefinitionExample
\(\triangle\) 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 \(\odot A\)