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.
More GeoGebra at bit.ly/mh-ggb