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2:3:4
jumlah sudut=180
sudut P = 2 x 180/9 = 2 x 20 = 40 derajat
sudut Q = 3 x 180/9 = 3 x 20 = 60 derajat
Sudut R = 4 x 180/9 = 4 x 20 = 80 derajat