Geometry symbols
Geometry: The branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids, and higher dimensional analogues.
Symbol | Symbol Name | Meaning / definition | Example |
---|---|---|---|
∠ | angle | formed by two rays | ∠ABC = 30º |
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measured angle | ![]() |
|
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spherical angle | ![]() |
|
∟ | right angle | = 90º | α = 90º |
º | degree | 1 turn = 360º | α = 60º |
´ | arcminute | 1º = 60´ | α = 60º59′ |
´´ | arcsecond | 1´ = 60´´ | α = 60º59’59” |
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line | infinite line | |
AB | line segment | line from point A to point B | |
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ray | line that start from point A | |
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arc | arc from point A to point B | ![]() |
| | perpendicular | perpendicular lines (90º 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 = π·d = 2·π·r |
rad | radians | radians angle unit | 360º = 2π rad |
grad | grads | grads angle unit | 360º = 400 grad |
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