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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