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Geometry symbols

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Symbol

Symbol Name

Meaning / definition

Example

angle

formed by two rays

ABC = 30°

http://www.rapidtables.com/math/symbols/geometry_symbols/measured_angle.gif

measured angle

 

http://www.rapidtables.com/math/symbols/geometry_symbols/measured_angle.gifABC = 30°

http://www.rapidtables.com/math/symbols/geometry_symbols/spherical_angle.gif

spherical angle

 

http://www.rapidtables.com/math/symbols/geometry_symbols/spherical_angle.gifAOB = 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″

http://www.rapidtables.com/math/symbols/geometry_symbols/line.gif

line

infinite line

 

AB

line segment

line from point A to point B

 

http://www.rapidtables.com/math/symbols/geometry_symbols/ray.gif

ray

line that start from point A

 

http://www.rapidtables.com/math/symbols/geometry_symbols/arc.gif

arc

arc from point A to point B

http://www.rapidtables.com/math/symbols/geometry_symbols/arc.gif= 60°

perpendicular

perpendicular lines (90° 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

360° = 2π rad

c

radians

radians angle unit

360° = 2π c

grad

gradians / gons

grads angle unit

360° = 400 grad

g

gradians / gons

grads angle unit

360° = 400 g

 

 

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