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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