In the given figure ∠ABC=46∘, then find the value of ∠BOA.
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Solution
From tangent secant theorem, angle in an alternate segment are equal, So ∠ABC=∠BEA=46∘
Now, the angle made by chord AB at the centre is double the angle made by chord at circumference,
hence, ∠BOA=2∠BEA ∠BOA=2×46∘ ∠BOA=92∘