Angle and Line Symbols

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Postulates and theorems

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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	\(\odot A\)