Q. 134.0( 18 Votes )

# <span lang="EN-US

Given that AB = AC and also DE || BC.

So by Basic proportionality theorem or Thales theorem,

=

=

Now adding 1 on both sides,

+ 1 = + 1

=

= … as AB = AD + DE and AC = AE + EC

But is given that AB = AC,

=

Hence,

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