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maka : < p + < q = 180°
x + 31° + 2x + 10° = 180°
3x = 141
x = 47°
besar p = x + 31 = 47 + 31 = 108°
besar q = 2x + 10° = 2(47°) + 10 = 94° +10° = 104°