In the figure $A B = A C$ and $O B = D C$ , find the ratio $∠ A B C : ∠ A C B$

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Solution

$\begin{matrix} A B = A C ∴ ∠ A B C = ∠ A C B H e n c e, R a t i o = \frac{∠ A B C}{∠ A C B} = 1 \end{matrix}$

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