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Lines And Angles

Question

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In ∆ABC, the bisectors of ∠ABC and ∠BCA intersect each other at 0. The measure of ∠BOC is:
$90 degree plus angle straight A$
$180 degree plus angle straight A$
$90 degree plus fraction numerator angle straight A over denominator 2 end fraction$
$90 degree minus fraction numerator angle straight A over denominator 2 end fraction$

Solution

B.

180 degree plus angle straight A

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