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b) 360 x 2/5 = 144 (tumpul)
c) 180 - (180 x 5/6) = 180 - 150 = 30 (lancip)
b. 2/5 putaran = 2/5x360= 144derajat = tumpul
c. 180 derajat- 5/6 sudut lurus= 180- 5/6x180= 180-150= 30derajat= lancip