Geometry Symbols

Symbol	Symbol Name	Meaning / definition	Example
$\angle$	measured angle		ABC = 30º
∠	angle	formed by two rays	∠ABC = 30º
∟	right angle	= 90º	α = 90º
	spherical angle		AOB = 30º
´	arcminute	1º = 60´	α = 60º59′
º	degree	1 turn = 360º	α = 60º
´´	arcsecond	1´ = 60´´	α = 60º59’59”
$\overrightarrow{AB}$	ray	line that start from point A
AB	line segment	line from point A to point B
|	perpendicular	perpendicular lines (90º angle)	AC | BC
≅	congruent to	equivalence of geometric shapes and size	∆ABC ≅∆XYZ
||	parallel	parallel lines	AB || CD
Δ	triangle	triangle shape	ΔABC ≅ΔBCD
~	similarity	same shapes, not same size	∆ABC ~∆XYZ
π	pi constant	π = 3.141592654… is the ratio between the circumference and diameter of a circle	c = π·d = 2·π·r
|x–y|	distance	distance between points x and y	| x–y | = 5
grad	grads	grads angle unit	360º = 400 grad
rad	radians	radians angle unit	360º = 2π rad