If you have a Right Triangle and you have one angle, alpha. How do you find the other angle, beta?
The interior angles of triangles always add up to a specific number of degrees, and that number is the same for all triangles. Do you know what it is?
Given a right triangle, you should automatically know the number of degrees of the angle that defines it as a right triangle. That is: all right angles are the same specific number of degrees, and a right triangle is only a right triangle because it contains one angle with this specific number of degrees. How many degrees are there in a right angle?
In this problem, you have been given another angle as well. You just add that to the number of degrees there always are in a right angle, and subtract them both from the well known number that all triangles add up to. The difference is the measure of the third angle.
are you in euclidean geometry? if so it is easy, if not it is not possible.
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