NCERT Solution Class IX Mathematics Triangles Question 6 (Ex 7.1)

Question 6:

In the given figure, AC = AE, AB = AD and ∠BAD = ∠EAC. Show that BC = DE. 

 

Answer:

It is given that ∠BAD = ∠EAC

∠BAD + ∠DAC = ∠EAC + ∠DAC

∠BAC = ∠DAE

In ∆BAC and ∆DAE,

AB = AD (Given)

∠BAC = ∠DAE (Proved above)

AC = AE (Given)

∆BAC ≅ ∆DAE (By SAS congruence rule)

∴ BC = DE (By CPCT)

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