Q7 of 153 Page 129

In the given figure, AB||CD. Prove that -=.

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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