Cyclic quadrilateral

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  • Thread starter lungoy
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  • #1
lungoy
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##TA## and ##TD## are tangent line of circle ##ABCD## and ##TB \parallel DC##. Show ##A,E,D,T## are cyclic quadrilateral.
I know ##x=\angle TAD= \angle TDA = \angle ACD= \angle TEA##
And ##\angle ATD=180-2x##
But I don't know how to prove ##\angle AED=x##.
Or there's another easily method?
Thanks.
Fig1.png
 
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Answers and Replies

  • #2
lungoy
2
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I've just known that ##\angle TEA = \angle TDA## prove ##AEDT## are cyclic.
The problem is solved. Thanks.
 

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