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B = A - 2 = (x+15) - 2 = x + 13
C = x+11
A + B + C = 180 derajad
(x + 5) + (x + 13) + (x + 11) = 180
3x + 29 = 180
3x = 151
x = 50,33 derajad
B = 2(x+15)
= 2x + 30
C = x + 11
x+15 + 2x+30 + x+11 = 180
4x + 56 = 180
4x = 180-56
4x = 124
x = 124/4
= 31
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