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Sudut P = 4 / (4+5) x 180 = 4/9 x 180 = 80 derajat
Sudut Q = 5 / (4+5) x 180 = 5/9 x 180 = 100 derajat
Sudut R = sudut P = 80 derajat
Sudut S = sudut Q = 100 derajat