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9x=90
x=10
sudut A = 4x=4*10 =40
pelurusnya = 180-40=140
9x = 90\x = 10
sudut A = 4x =4 ( 10 ) = 40
sudut penyikunya = 5x = 5 ( 10 ) = 50 derajat
sudut pelurusnya = 180 - 40 = 140