Videos etc

Videos from the @sparksmaths channel on youtube

Random Factoid

Eh? Four?

A4 paper is 210x297mm. This is annoying if you want to easily measure halfway along the long side, but there is a very good reason for it. When you fold it in half you get a half size copy in the same proportion. This is not an accident. It only happens when the sides are in the ratio 1: √2.

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