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c^2 = a^2 + b^2 - 2ab cos (α)
[ (15)^2 - (10)^2 - (12)^2 ] /- 2(10)(12) = cos (α)
α = 85,46°
Ley del seno:
10 / sen (β) = 15 / sen (85,46°)
sen (β) = 10 * sen (85,46°) / 15
sen (β) = 0,66457
β = 41,65°
ω = 180° - α - β
ω = 180° - 85,46° - 41,65°
ω = 52,89°
ángulo menor = 41,65°