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Equal Angles Subtend Equal Sides

The given fig...

Question

The given figure, O is the center of the circle and AB = AC . If $∠$ ABC = $60^{0}$ , find $∠$ BCA.

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Solution

Given $A B = A C$
$∴ ∡ A B C = ∡ B C A$
$\Rightarrow ∡ B C A = 60 °$

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