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1/4 putaran = 1/4 x 360 derajat = 90 derajat
1 1/2 putaran = 1 putaran + 1/2 putaran = 360 + 1/2 360 = 360 + 180 = 540 derajat
b. pelurus 1 1/2 x 360 = 540 = 180 "