Geometry Symbols

Table of symbols in geometry:

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''
AB	line	line from point A to point B
	ray	line that start from point A
|	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 circle's perimeter and circumference	P = 2·π·r
rad	radians	radians angle unit	360º = 2π rad
grad	grads	grads angle unit	360º = 400 grad

 

Algebra symbols ►

 

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See also

• Math symbols
• Basic math symbols
• Algebra symbols
• Statistical symbols
• Set symbols