Objects are congruent if they are the same size and shape, or an exact reflection of one another. If objects are not congruent, they are dissimilar in either size, shape or both.
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They occur when you divide something on a line of symmetry.
Then nothing. It depends on the context in which the two angles occur.
because a smaller critical angle means that it is easier for total internal reflection to occur, which is the desirable quality in an optical fibre.
Occur by the increase of effect of one risk or of each added risk
A point.