is the ratio between the circumference and diameter of a circle rad radians radians angle unit 360° = 2π rad c radians radians unit 360° = 2π c 360° = 400 gradians / grad grads angle unit gons grad gradians / g grads angle unit 360° = 400 g gons Algebra symbols Symbol Meaning / definition Example Name x when 2x = 4, then x = 2 x variable unknown value to find ≡ equivalence identical to equal by ≜ equal by definition definition equal by := equal by definition definition ~ 11 ~ 10 weak approximation ≈ approximation sin(0.01) 0.01 ≈ equal y x when y = kx, proportional ∝ ∝ proportional to to kconstant ∞ much less much less than 1 1000000 ≪ ≪ than
is the ratio between the circumference and diameter of a circle rad radians radians angle unit 360° = 2π rad c radians radians unit 360° = 2π c grad gradians / gons grads angle unit 360° = 400 grad g gradians / gons grads angle unit 360° = 400 g Algebra symbols Symbol Name Meaning / definition Example x x variable unknown value to find when 2x = 4, then x = 2 ≡ equivalence identical to ≜ equal by definition equal by definition := equal by definition equal by definition ~ weak approximation 11 ~ 10 ≈ equal approximation sin(0.01) ≈ 0.01 ∝ proportional to proportional to y ∝ x when y = kx, kconstant ∞ ≪ much less than much less than 1 ≪ 1000000
basic_math_symbols.docx