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Copia di Rectangle Perimeter Problem

Inspired by this problem at Brilliant: https://brilliant.org/profile/arron-udsft3/sets/arrons-picks-level-1-challenges-2015-vi/236198/problem/congruent-perimeter/ This sketch solves all of them! Use to make up problems, or use to find the rather interesting proportionality and diophantine structure hiding behind these.
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