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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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Well, they are no telling you that the third side is the hypo. It can be A or B side. That said, you should verify something like this a2 - c2...
Where does it say about hypotenuse?