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Question

In the adjoining figure, AB CD. Find the value of x.
183809.png

A
x=40
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B
x=30
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C
x=50
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D
None of these
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Solution

The correct option is D x=40
GivenDCE=100o&ABE=120oLetusextendABsuchthatitmeetsCEatF&extendstillG.GivenABCD,soAGCD.LetCEbethetransversal.ThenDCE=GFE=100o[Correspondingangles]ABE+EBF=180o[SinceABFisastraightangle]EBF=180120=60oGFE+EFB=180o[SinceBFGisastraightangle]EFB=180100=80oNowinBFE,EBF+EFB+FEB=180o60+80+xo=180oxo=180140xo=40o
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