NCERT Solution Class IX Mathematics Triangles Question 2 (Ex 7.1)

Question 2:

ABCD is a quadrilateral in which AD = BC and ∠DAB = ∠CBA (See the given figure).

Prove that

(i) ∆ABD ≅ ∆BAC

(ii) BD = AC

(iii) ∠ABD = ∠BAC.

Answer:

In ∆ABD and ∆BAC,

AD = BC (Given)

∠DAB = ∠CBA (Given)

AB = BA (Common)

∆ABD ≅ ∆BAC (By SAS congruence rule)

∴ BD = AC (By CPCT)

And, ∠ABD = ∠BAC (By CPCT)

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