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Introduction to Triangle

In a triangle...

Question

In a triangle ABC, it is given that $∠ B = 105^{o}$ and $∠ C = 50^{o}$ . Find $∠ A$ .

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Solution

From the given triangle,
The sum of interior angles is 180
$∠ A + 105 + 50 = 180^{0}$
$∠ A = 25^{0}$

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