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1 lingkaran = 360 derajat
hobi menari = 72 derajat
hobi menyanyi= 126 derajat
hobi melukis = 72 derajat
hobi voli = 36 derajat
sepak bola = x derajat
360= 72+126+72+36+x(sepak bola)
360=306 + x
x= 360 - 306
x= 54 derajat
x jumlah siswa
x 40= 6 siswa