1. In the given figure, AB || CD, LFAE +90", ZAFE - 40", find ECD.
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Answer:
By angle sum property in triangle FAE.
90o + 40o + AEF = 180o
Or, AEF = 50o
CEB = AEF = 50o (vertically opp. angles)
ECD + CEB = 180o
Or, ECD + 50o = 180o
ECD = 130o
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