The answer depends on the context. Angles are related in many ways: parallel lines, angles at a point, angles in a polygon - all impose constraints on angles from which their measure may be determined.
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To find the measure of an angle, you need to know the size of the entire angle and the other angles within the angle. Then, you subtract the smaller, known angles from the entire, large angle and you should get the measure of the missing angle.
124 degrees
Polygons (regular, complex, irregular, etc) comes in many shapes, with a variety of interior angle totals. So the polygon in question needs to be more specifically named.
Are you talking about a triangle? If so, 33
The angles are all 90 degrees in a square.