It is not a specific mathematical term. It simply means "put on top of".
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There doesn't seem to be any real antonym for the word superimposed. It would make sense to use the word supraimposed, (as supra means earlier) however I have never seen that word used.
Circles that have congruent radii. Congruent=coinciding at all points when superimposed (http://dictionary.reference.com/browse/congruent)
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Math is related to math because math(1) is technically math(2) itself, because there is really no description how math(1) is the same as math(2). There is only one math, except for types of math, like algebra.
Math is not just math you have to study it like subtration and addition. You use it on sheets or paper work.