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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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Each triangle has internal angles summing up to 180 degrees.
So, we multiply the number of triangles by 180 to get the total sum of internal angles.
Why do we multiply it by 180?