OE bisectoare =>AOE=EOC si AOD=4AOE=>
AOD=2AOC
AOD+AOC=180<=>2AOC+AOC=180, 3AOC=180, AOC=60<=>AOD=120
AOD=BOC=120
BOE=BOC+EOC si EOC=AOC:2=60:2=30, deci
BOE=120+30=150°