This little gem was the first time I have had the opportunity to use this pre made powerpoint from TES - Have I got a Hypotenuse for you. (TES login required)
Today we just did finding the hypotenuse, and they got completely into it! I had my class into teams, where they could earn points or steal points from the other groups. They worked on whiteboards around the room. It made my heart sing to see them working together, collaborating, checking, discussing and analyzing their work (not to mention engaging and having some friendly rivalry on the side).
There are versions out to find the shorter side and mix.