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- ...f a sphere such that the [[union (mathematics)|union]] of the subsets is [[congruent]] to each of the original sets—a concept that later laid the groundwo11 KB (1,809 words) - 00:49, 1 June 2015
- ...across two isomorphic planes, the planes are said to be [[congruent planes|congruent]].30 KB (4,907 words) - 03:47, 11 May 2013