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In an isosceles triangle ABC, with AB = AC, the bisectors of B and C intersect each other at O. Join A to O. Show that: (i) OB = OC (ii) AO bisects A. Q.1

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Sir please help me to solve the ncert class 9th solution of chapter triangles.How I solve this question of exercise 7.2 question number 1. Find the simplest and easiest solution of this question , also give me the best solution of this question. In an isosceles triangle ABC, with AB = AC, the bisectors of B and C intersect each other at O. Join A to O. Show that: (i) OB = OC (ii) AO bisects A.

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  1. Ncert solutions class 9 chapter 7-9

    Solution:

    Given:

    AB = AC and

    the bisectors of B and C intersect each other at O

    (i) Since ABC is an isosceles with AB = AC,

    B = C

    ½ B = ½ C

    ⇒ OBC = OCB (Angle bisectors)

    ∴ OB = OC (Side opposite to the equal angles are equal.)

    (ii) In ΔAOB and ΔAOC,

    AB = AC (Given in the question)

    AO = AO (Common arm)

    OB = OC (As Proved Already)

    So, ΔAOB ΔAOC by SSS congruence condition.

    BAO = CAO (by CPCT)

    Thus, AO bisects A.

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