Table of Geometric Symbols with Examples

 

Math Geometric Symbols with Examples

Symbol	Symbol Name	Symbol Meaning	Example
	Arc	arc from point A to point B	= 60º
º	Degree	1 turn = 360º	α = 60º
∠	Angle	formed by two rays	∠ABC = 30º
	Measured Angle		ABC = 30º
	Spherical Angle		AOB = 30º
∟	Right Angle	= 90º	α = 90º
'	Arcminute / Prime	1º = 60'	α = 60º59'
''	Arcsecond / Double Prime	1' = 60''	α = 60º59'59''
	Line	infinite line
AB	Line Segment	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 the circumference and diameter of a circle	c = π.d = 2 .π.r
rad	Radians	radians angle unit	360º = 2π rad
grad	Grads	grads angle unit	360º = 400 grad

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