Common Symbols Used in Geometry
Here are the most common geometrical symbols:
Symbol | Meaning | Example | In Words |
Triangle |
| Triangle ABC has three equal sides | |
Angle |
| The angle formed by ABC is 45 degrees. | |
Perpendicular | AB | The line AB is perpendicular to line CD | |
Parallel | EF | The line EF is parallel to line GH | |
Degrees | 360° makes a full circle |
| |
Right Angle (90°) |
| A right angle is 90 degrees | |
Line Segment "AB" | AB | The line between A and B | |
Line "AB" | The infinite line that includes A and B | ||
Ray "AB" | The line that starts at A, goes through B and continues on | ||
Congruent (same shape and size) |
| Triangle ABC is congruent to triangle DEF | |
Similar (same shape, different size) |
| Triangle DEF is similar to triangle MNO | |
Therefore | a=b | a equals b, therefore b equals a |
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