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A. The angle is smaller than a right angle
right angle triangle
Fora right angle triangle: cosine angle = adjacent/hypotenuse
If Y is the right angle then the third angle is indeterminate. Otherwise it is 90 - Y degrees.
A right angle is always 90 degrees. Another Answer:- If you mean the length of the hypotenuse then use Pythagoras' theorem which is applicable to right angle triangles