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Question

Find ABF from the given figure.


A

30º

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B

45º

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C

60º

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D

75º

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Solution

The correct option is C

60º


BCD+BCH=180 [ Linear pair]
BCD = 180 - 35 = 145
In quadrilateral BEDC, BED + EDC + DCB + CBE = 360
CBE = 360 - (105 + 50 + 145) = 60
So, ABF = CBE = 60(Vertically opposite angles)


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