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420/ 70 = LJ KLJ/60
420 x 60 = 70 x LJ KLJ
360 = Luas Juring KLJ
b. PBusur HG/ sudut GHL = PBusur KJ/ sudur KLJ
420 / 60 = PB KJ / 70
60 x PB KJ = 420 x 70
PBusur KJ = 490 cm