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How to find the angle between two vectors

Learn how to determine the angle between two vectors. To determine the angle between two vectors you will need to know how to ...
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How to Calculate the String Angle of a Kite vs. a Balloon

I'm reading Randall Munroe's book How To: Absurd Scientific Advice for Common Real-World Problems. I probably don't have to tell you this, but it's awesome (as is everything from Randall Munroe, the ...