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Right angles are always 90 degrees, (or pi/2 radians if you're into such things) so there isnt really anything to calculate.

You can check that a triangle contains a right angle by verifying it obeys pythagoras theorem,

x2 + y2 = h2 where x and y are the lengths of the two other sides and h is the length of the longest side (the hypotenuse).

If this is the case, the right angle is the one opposite that side, if not, the triangle doesn't contain a right angle.

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Q: How do you calculate the right angle given the height and length?
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