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= 1/9 x 2π rad = 2/9 π rad
b) 3/8 putaran = 3/8 x 360° = 135°
= 3/8 x 2π rad = 3/4 π rad
c) 1/5 putaran = 1/5 x 360° = 72°
= 1/5 x 2π rad = 2/5 π rad
selanjutnya kerjakan sepert di atas sebagai latihan ....