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Common Symbols Used in Geometry

Symbols save time and space when writing.

Here are the most common geometrical symbols:

Symbol

Meaning

Example

In Words

triangle_big

Triangle

triangle-sm ABC has 3 equal sides

Triangle ABC has three equal sides

angle_big

Angle

angle-sm ABC is 45°

The angle formed by ABC is 45 degrees.

perpendicular_big

Perpendicular

ABperpendicular-smCD

The line AB is perpendicular to line CD

parallel_big

Parallel

EF parallel-sm GH

The line EF is parallel to line GH

degree

Degrees

360° makes a full circle

 

right-angle_big

Right Angle (90°)

right-angle-sm is 90°

A right angle is 90 degrees

ab_big1

Line Segment "AB"

AB

The line between A and B

ab_big2

Line "AB"

ab-sm2

The infinite line that includes A and B

ab_big3

Ray "AB"

ab-sm3

The line that starts at A, goes through B and continues on

congruent_Big

Congruent (same shape and size)

triangle-sm ABCcongruent-smtriangle-sm DEF

Triangle ABC is congruent to triangle DEF

similar_big

Similar (same shape, different size)

triangle-sm DEFsimilar-smtriangle-sm MNO

Triangle DEF is similar to triangle MNO

Therefore_big

Therefore

a=b therefore-sm b=a

a equals b, therefore b equals a

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