Q. 73.8( 25 Votes )
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Answer :
Draw a line EF||AB||CD.
+
=180° [Because AB||EF and AE is the transversal] __________________ (i)
+
=180° [Because DC||EF and CE is the transversal] __________________ (ii)
From equations (i) and (ii)
⇒ 
+
=
+
⇒ 
-
=
-
⇒ 
-
= 
Proved.
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