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8) < QSR = (180 - 40) / 2 = 140 / 2 = 70°
< QST = 180 - 70 = 110° (berpelurus)
< TPQ + < QST = 180
x + 110 = 180
x = 180 - 110
x = 70°
semoga membantu ya :)