Geometry Symbols
Table of symbols in geometry:
Symbol Symbol Name Meaning / definition Example ∠ angle formed by two rays ∠ABC = 30º measured angle ABC = 30º
spherical angle AOB = 30º
∟ right angle = 90º α = 90º º degree 1 turn = 360º α = 60º ´ arcminute 1º = 60´ α = 60º59' ´´ arcsecond 1´ = 60´´ α = 60º59'59'' line infinite line AB line segment line from point A to point B ray line that start from point A arc arc from point A to point B = 60º
| 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
See also
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