Find the unknown angles-

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cosidering lines l and m are parallel and another l is acting as a tranversal.d+60°=180°     (linear pair)d=120°and,b=60°     (vertically opp. angles)d=c=120°     (vertically opp. angles)c=g=120°      (alternate int. angles)and g=f=120°    (vertically opp. angles)e=60°      (alternate int. angles)and,e=h=60°      (vertically opp. angles)

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angle b=60[vertically opposite] ,b+c =1800 so angle c =1800_600=1200,   angle d = 1200​[vertically opp to anglec.]
angle g= angleb [alternate angles to angle c,  angle e is 600[alternate to angle 600] angle h= 600[corresponding to 600]
angle f = 1200 [corresponding to angle c]
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