In an isosceles triangle ABC, with AB = AC, the bisectors of ∠B and ∠C intersect each other at O. Join A to O. Which of the following is true?
A
OB = OC
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B
OA = OC
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C
AB = OB
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D
AC = OC
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Solution
The correct option is A OB = OC
It is given that AB=AC. ∴∠B=∠C (Angles opposite to equal sides of a triangle are equal) ⇒12(∠B)=12(∠C) OB and OC are bisectors of ∠B and ∠C. ⇒∠OBC=∠OCB ∴ OB = OC (Sides opposite to equal angles are equal)