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''
line infinite line  
AB line segment line from point A to point B  
ray line that start from point A  
arc arc from point A to point B = 60º
| 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 = πd = 2πr
rad radians radians angle unit 360º = 2π rad
grad grads grads angle unit 360º = 400 grad


Algebra symbols ►


See also

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