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maka 3y + 2x + 54 = 180
3y + 2x = 126
perhatikan rusuk AB = CB
maka sudut ACB = BAC
maka 3y = 54
y = 18
kembali ke persamaan 3y + 2x = 126
54 + 2x= 126
2x = 72
x = 36
maka x + y = 18 + 36
x + y = 54 (C)
sisanya dari 180-(54+54) = 72
2x = 72 jadi x = 36
36+18=54
c. 54