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If AD = AE and BD = CE then :

  1. △ ADE ~ △ ACB

  2. △ ABC ~ △ ACB

  3. △ ABD ~ △ ABC

  4. △ ADE ~ △ ABC

If AD = AE and BD = CE then : Similarity, Concise Mathematics Solutions ICSE Class 10.

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Answer

Given,

⇒ AD = AE = x (let)

⇒ BD = CE = y (let)

From figure,

⇒ AB = AD + BD = x + y

⇒ AC = AE + EC = x + y

In △ ADE and △ ABC,

⇒ ∠DAE = ∠BAC

ADAB=AEAC=xx+y\dfrac{AD}{AB} = \dfrac{AE}{AC} = \dfrac{x}{x + y}

∴ △ ADE ~ △ ABC (By S.A.S. postulate)

Hence, Option 4 is the correct option.

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