Inspired by this problem at Brilliant:[br][url]https://brilliant.org/profile/arron-udsft3/sets/arrons-picks-level-1-challenges-2015-vi/236198/problem/congruent-perimeter/[/url][br][br]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 [url]bit.ly/mh-ggb[/url]