## 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 […]