Important Geometry Symbols for Math Students

 

Symbol
Symbol Name
Meaning / definition
Example


angle
formed by two rays
∠ABC = 30°

measured angle
 
ABC = 30°

spherical angle
 
AOB = 30°


right angle
= 90°
α = 90°

°
degree
1 turn = 360°
α = 60°

deg
degree
1 turn = 360deg
α = 60deg


prime
arcminute, 1° = 60′
α = 60°59′


double prime
arcsecond, 1′ = 60″
α = 60°59′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 […]

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