How to find if acute / obtuse triangles are congruent

SSAT Upper Level Quantitative · Learn by Concept

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SSAT Upper Level Quantitative › How to find if acute / obtuse triangles are congruent

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If the vertex angle of an isosceles triangle is 30 degrees, what is the value of the angle that is exterior to one of the base angles?

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Explanation

First, you subtract one angle so . Because there are 2 base angles you divide that value by 2 to get 75 Degrees. The exterior angle and the base angle are supplementary angles so .

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