Q. 34.4( 16 Votes )

In the adjoining figure, ABCD is a quadrilateral in which AB||DC and AD||BC. Prove that =.


Answer :

Given AB||DC and AD||BC


Therefore, +=180° _____________ (i)


+=180° _____________ (ii)


From equations (i) and (ii)


+ = +


= Proved.


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