you know a triangle always measure 180 degrees
the two angles you are given add them together
then subtract 180-_____the blank is for the sum of the two addends
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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.