CBSE Class 10 Answered
Plz solve the question.
Asked by adilaman.java | 08 Feb, 2019, 06:03: PM
Expert Answer
AFC + AEC = BFD+AEC = 360 - EBF - EDF ...................(1)
in eqn. (1) we used the relation AFC = BFD (vertically opposite angles)
EBF = 180-ABC ....................(2)
EDF = 180-ADC ...................(3)
using (2) and (3) in eqn.(1), we have AFC+AEC = 360-(180-ABC)-(180-ADC) = ABC + ADC ....................(4)
we have ABC = (1/2)AOC and ADC = (1/2)AOC because angle subtended by a chord at center is twice the angle subtended at
circumference by the same chord . using these relations in eqn.(4), we have AFC+AEC = AOC
Answered by Thiyagarajan K | 08 Feb, 2019, 08:48: PM
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