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Complement of Theta.

In a right angled triangle, one of the angles is denoted theta. What is the symbol for the other angle? I have a vague feeling it's lower case sigma or phi but I can't find anything to comfirm or deny that.
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ArishMell · 70-79, M
There is no standard delineation for the angles of a triangle as long as it is clear and not liable to be confused with others within the particular case; though some of the Greek letters are conventional for certain applications.

Common ones are -


Δ and δ - the Differentiation operators,

π That wonderfully poetically-described "irrational and transcendental number" Pi, crops up all over the place, not just in simple circle and sphere sums!

Σ is capital-Sigma, the series / summation operator, with superscript / subscript limit notes,

λ and σ are Lambda and Rho, conventionally used for wavelength and density respectively, in fields such as Acoustics,

α, β and [i]γ[/i] are used to denote the alpha, beta and gamma forms of radioactivity. Gamma might just show here as an italic 'y',

Ω - Omega, for Ohms, of electrical resistance,

ω - lower-case omega, used in calculations of rotation.
helenS · 36-40, F
@ArishMell σ is sigma, not rho.
WandererTony · 56-60, M
@helenS @ArishMell @rob19
Rho = Ρ in caps and ρ in small.
ArishMell · 70-79, M
@helenS Oh - sorry. Thank you for the correction. I'd mis-remembered it from seeing it occasionally at work... but that was a while ago!