Geometry Symbols
Geometry is a branch of mathematics that deals with the properties of configurations of geometric objects - (straight) lines, circles and points being the most basic.
The area of mathematics that deals with space, lines, shapes and points
- Plane Geometry is about flat shapes like triangles, circles, and lines,
- Solid Geometry is about solid (3-dimensional) shapes like spheres and cubes.
Geometry Symbol Chart
Symbol |
Symbol Name |
Meaning/definition of the Symbols |
Example |
∠ | measured angle | ABC = 30º | |
∠ | angle | formed by two rays | ∠ABC = 30º |
∟ | right angle | = 90º | α = 90º |
spherical angle | AOB = 30º | ||
´ | arcminute | 1º = 60´ | α = 60º59′ |
º | degree | 1 turn = 360º | α = 60º |
´´ | arcsecond | 1´ = 60´´ | α = 60º59’59” |
\(\overrightarrow{AB}\)< | ray | line that start from point A | |
AB | line segment | the line from point A to point B | |
| | perpendicular | perpendicular lines (90º angle) | AC | BC |
≅ | congruent to | equivalence of geometric shapes and size | ∆ABC ≅∆XYZ |
|| | parallel | parallel lines | AB || CD |
Δ | triangle | triangle shape | ΔABC ≅ΔBCD |
~ | similarity | same shapes, not the same size | ∆ABC ~∆XYZ |
π | pi constant | π = 3.141592654…
is the ratio between the circumference and diameter of a circle |
c = π·d = 2·π·r |
|x–y| | distance | distance between points x and y | | x–y | = 5 |
grad | grads | grads angle unit | 360º = 400 grad |
rad | radians | radians angle unit | 360º = 2π rad |