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9x = (180 - 9) derajat
9x = 171 derajat
x = 19 derajat
besar sudut pelurus SQR = (4x + 9) derajat = (4x19 + 9) derajat = 85 derajat
180 = 9x+9
180 -9 = 9x
171 = 9x
x= 171/9
x= 19
sudut SQR = 4x+9 = 4(19) + 9 =76 + 9 = 85
jawabanku begitu :D
jadi sudutPQS = 5X =5(19) = 95