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2015-05-01T14:35:09+08:00

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The sum of the interior angles of a triangle is 180°
∠A+∠B+∠C=180°

So we already know one angle which is the vertex angle

48°+∠B+∠C=180°
Since ∠B=∠C

2∠B=180°-48°
2B=132°
∠B=66°

Therefore the base angles are each equal to 66°


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