Geometry symbols

Geometry: The branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids, and higher dimensional analogues.

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 = 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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