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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.
Get started now by creating a new collection.
Also, if you imagine that two sides of a triangle are as long together as the third one, that would make their angle 180° which isn't a triangle anymore.