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b.) 2/3 putaran penuh = 2/3 x 360 = 240 (sudut refleks)
c.) 180 - 5/6sudut lurus = 180 - 5/6 x 180 = 1/6x180 = 30 (lancip)
2.a) sudut terkecil pukul 04.30 = 45 derajat
b.) pukul 07.20 = 90 + 1/2(20) = 90 + 10 = 100 derajat
c.) pukul 05.12 = 18+60+1/2(12) = 78 + 6 = 84 derajat