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A triangle has 2 angles measuring 40 degrees and 50 degrees. What is the measure of the 3rd angle and classify the triangle.

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A triangle has all three angles summing up to 180. If two of the sides measure 40 degrees and 50 degrees, then the third side measures as follows;


\begin{gathered} 40+50+A=180 \\ A=180-40-50 \\ A=90 \end{gathered}

The third angle, which is labelled as angle A measures 90 degrees, and that means the triangle is a "right angled triangle."

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