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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.
There are rounding issues.
count your colons! :)
Yes, you are correct. Left or right doesnt matter, just rotation. I will update.
try changing arond the value of pi to be within 5 decimal digits?
There should be no rounding issue.