How to do 20th question.
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Angle CBG = Angle CED (180°-x)
Angle GCB = Angle DCE (Vertically opposite angle)
CB = CE (given)
So by ASA criteria Triangle GCB is congruent to Triangle DCE.
Angle GCB = Angle DCE (Vertically opposite angle)
CB = CE (given)
So by ASA criteria Triangle GCB is congruent to Triangle DCE.
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