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5x + 7x = 180
12x = 180
x = 15
sudut Q = 5x
sudut Q = 5(15)
sudut Q = 75
sudut R = 7x
sudut R = 7(15)
sudut R = 105
sudut S = siku-siku
sudut S = 90
sudut P = siku-siku
sudut P = 90