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Kalau pelurus;
180 = (x+18)+(2x+15)
180 = 3x + 33
3x = 147
x = 147/3
x = 49
B = 2x + 15 = 2(49)+15 = 113
Kalau penyiku;
90 = (x+18) + (2x+15)
90 = 3x + 33
3x = 57
x = 19
B = 2x + 15 = 2(19) + 15 = 38 + 15 = 53