As far as I can tell, it is missing and nobody here seems to know anything about it!
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It depends on whether X is the missing side, one of the angles or some other measure of the triangle.
180-x-y (x and y are the sides you already know) there are 180 degrees in a triangle. The remaining # is the last angle
The angles must add up to 180o Let the missing angle be x so, x + 62o + 47o = 180o x = 71o
It depends on what measure is missing.
It depends on what is known about the triangle.