A Circle would fit this definition nicely, as the sum of its angles is infinite. Infinity, however, is irrational, and therefore we say that it does not have any angles.
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No, a square is a 2d shape, although a 3d shape can be made using multiple squares at different angles than 180 or 0 to each other.
Angles on the outside of the shape
a congruent shape HAS TO HAVE ALL CONGRUENT ANGLES OR IT WOULDNT BE A CONGRUENT sHAPE
trapizoid
4 angles