By using trigonometry that is applicable to a right angle triangle.
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The hypotenuse is NEVER opposite an acute angle. It's always the side of the right triangle that's opposite the right angle.
A triangle with an hypotenuse has a right angle that measures 90 degrees and two other acute angles,
The measure of the smaller acute angle of the triangle is: 17.46 degrees.
One is the hypotenuse times the sine of one acute angle, the other, the hypotenuse times the sine of the other acute angle (or the cosine of the first).
The side opposite the right angle of a right angle triangle is the hypotenuse