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Formula
b^2= a^2 +c^2-2a.c.Cos°
b^2 = 56^2 +40^2-2(56)(40).Cos 22
b^2 = 3136 + 1600 - 4153.78
b^2 = 582.22
b = 24.1
a/sen A = b / Sen B
sen A = sen B .a /b
sen A = sen 22 * 56/ 24.1
sen A = 0.87
A = sen ^ -1 ( 0.87 )
A = 60.5 °
C = 180 - 22 - 60.5
C = 97,5 °