In the fig., the measure of angleABC is :
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KANISHKA11156:
You try again @ mauryaraj
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20°{ang. A outside } = 20°{angle A inside} ( Vertically opposite angles )
ang. ACD = ang. A inside + ang. ABC
( Exterior angle property )
120° = 20° + ang. ABC
100° = ang. ABC
ang. ACD = ang. A inside + ang. ABC
( Exterior angle property )
120° = 20° + ang. ABC
100° = ang. ABC
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