Question

in figure measure angle BOC=120degrees,measure angle ABO=20 degrees,measure angle ACO=15 degrees find measure angle BAC

Answer 1

Inte. angle BOC  = 360 - 120 = 240

Ang. BAC  = 360 - ( 240 + 15 + 20) =  85

Answer 2

Reflex<BOC = 360-120=240°

Ref <BOC + <ABO+ <ACO+ <BAC = 360° ( ANGLE SUM)

240°+20°+15°+ <BAC = 360°

360°-275° = <BAC

<BAC = 85°

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