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Jadi 90 / 20 = 4,5 org/derajat
Penyelesaian :
sudut yang mengikuti pencak silat = 380 - 90 - 60 - 156 = 74 derajat
maka yang ikut pencak silat = 74 x 4,5 = 16,44 = 16 orang.
jawabannya D = 16 Orang
90 = 54.20
90 = 1080
= 1080/90
= 12