Geometry symbols
| Symbol | Symbol Name | Meaning/Definition | Example |
|---|---|---|---|
| \( ∠ \) | angle | formed by two rays | \( ∠ABC = 30° \) |
| \( \measuredangle \) | measured angle | \( \measuredangle ABC = 30° \) | |
| \( \sphericalangle \) | spherical angle | \( \sphericalangle AOB = 30° \) | |
| \( ∟ \) | 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″ | \( α = 60°59′59″ \) |
| \( \overleftrightarrow{AB} \) | line | infinite line | \( \) |
| \( AB \) | line segment | line from point A to point B | \( \) |
| \( \overrightarrow{AB} \) | ray | line that start from point A | \( \) |
| \( \overparen{AB} \) | arc | arc from point A to point B | \( \overparen{AB}= 60° \) |
| \( ⊥ \) | perpendicular | perpendicular lines (90° angle) | \( AC ⊥ BC \) |
| \( ∥ \) | parallel | parallel lines | \( AB ∥ CD \) |
| \( \cong \) | congruent to | equivalence of geometric shapes and size | \( ∆ABC\cong ∆XYZ \) |
| \( ~ \) | similarity | same shapes, not same size | \( ∆ABC~ ∆XYZ \) |
| \( Δ \) | triangle | triangle shape | \( ∆ABC\cong ∆XYZ \) |
| \( |x-y| \) | 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 | \( 360° = 400^g \) |
