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a/SinA = b/SinB = c/SinC
aturan cos
a^2 = b^2 + c^2 - 2bcCosA
b^2 = a^2 + c^2 - 2acCosB
c^2 = a^2 + b^2 - 2abCosC
Rumus phythagoras thea