Th seni
ΑΒ = c = 6·a ; β = pi/4; α = pi/12
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γ = pi - (α + β) = pi - (pi/12 + pi/4) = 2·pi/3
c/SIN(γ) = Α/SIN(α)
6·a/SIN(2·pi/3) = Α/SIN(pi/12)
Α = a·(3·√2 - √6) misura del lato BC
c/SIN(γ) = b/SIN(β)
6·a/SIN(2·pi/3) = b/SIN(pi/4)
b = 2·√6·a misura del lato AC