It is the angle opposite the hypotenuse which measures 90 degrees
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if the triangle has one right angle in it
By using Pythagoras' theorem for a right angle triangle.
right angle!
Not the best way of finding out if a triangle is right angled. But if you can find two if the sides which have gradients which when multiplied together gives -1, then the angle between them is a right-angle. This comes from the fact that if the slope of a line is a/b, then the slope of a perpendicular line is -b/a and the product of (a/b)(-b/a)=-1.
It is the longest side of a right angle triangle.