If it's a triangle then: 180-sum of known angles = unknown angle
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The angles are all 90 degrees in a square.
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.
You did not specify total what: total perimeter, total of interior angles, total area, ... You also need the measurements of the sides.
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.
The measurements of congruent angles are identical