There are many ways of finding angles in triangles...one of which is to get a protractor, of course...
Also, if you know two angles, you can find the third by just subtracting the sum of the two angles from 180, which is the total number of degrees in any triangle.
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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.