Q. 73.8( 24 Votes )
In the given figure, AB||CD. Prove that
-
=
.

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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