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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.
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I agree that this problem is lacking a bit in explanation. It necessitates too much knowledge on the mathematical properties of a triangle. I would love to have a bit more information included in the explanation, or at least include a bit more description of the intended task