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2x + x + 15° + 3x =180°
6x = 165°
x = 165°/6
A = 2x = 2 165° / 6 = 165°/3 = 55°
sudut B = x + 15
sudut C = 3x
180 = 2x + x + 15 + 3x
180 = 6x + 15
180 - 15 = 6x
165 = 6x
165/6 =x
27,5 = x
sudut A = 2x = 2(27,5) = 55 derajat
maf kalo salah :)