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9x = 180 drjt.
9x : 9 = 180:9
x = 20
6x = 20×6=120
BERTOLAK BELAKANG.
sudut boc= d.120.
10. 90+x+2x= 180.
90+3x=180.
3x= 180-90
3x=90(Dibagi tiga dua duanya)
x= 30.
sudut roq bertolak blkng dengan sudut pot
sudut pot = a.30 derajat