All of the angles in a triangle add up to 180, so if one angel was 34, and another angle was 67, than the mystery angle would be 79. I got that because 180-(a+b)=c. 34 is a, and 67 is b.
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if the triangle has one right angle in it
right angle!
At each vertex of a triangle, an exterior angle of the triangle may be formed by extending ONE SIDE of the triangle.
By using Pythagoras' theorem for a right angle triangle.
It is the longest side of a right angle triangle.