NCERT Solution Class IX Mathematics Triangles Question 2 (Ex 7.3)

Question 2:

AD is an altitude of an isosceles triangles ABC in which AB = AC. Show that

(i)    AD bisects BC                 (ii)    AD bisects ∠A.

Answer:

 

(i) In ∆BAD and ∆CAD,

∠ADB = ∠ADC (Each 90º as AD is an altitude)

AB = AC (Given)

AD = AD (Common)

∆BAD ≅ ∆CAD (By RHS Congruence rule)

BD = CD (By CPCT)

Hence, AD bisects BC.

(ii) Also, by CPCT,

∠BAD = ∠CAD

Hence, AD bisects ∠A.

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