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3x + 5x + 7x=180
15x=180
x=180/15
x=12
sudut terkecil=3x=3 × 12=36 derajat
---> 3 : 90 ÷ 360 = 12
kalau 5xderajat --> 5 x 90 ÷ 360 = 20,sedangkan 7xderajat = 28