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In the adjoining figure, AC = BD. If ∠CAB = ∠DBA, then ∠ACB is equal to

  1. ∠BAD

  2. ∠ABC

  3. ∠ABD

  4. ∠BDA

In the adjoining figure, AC = BD. If ∠CAB = ∠DBA, then ∠ACB is equal to? Triangles, ML Aggarwal Understanding Mathematics Solutions ICSE Class 9.

Triangles

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Answer

In △CAB and △DBA,

AC = DB (Given)

AB = AB (Common)

∠CAB = ∠DBA (Given)

Hence, △CAB ≅ △DBA by SAS axiom.

We know that corresponding parts of congruent triangles are equal.

∴ ∠ACB = ∠BDA.

Hence, Option 4 is the correct answer.

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