The Mathematics Behind A4 Paper - Why is A4 Sized This Way?

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Have you ever wondered why A4 paper is the size it is or how it relates to A3 paper and other A-Series paper sizes? In this video we look at how A-series paper sizes are related to each other, how they were originally defined and what links the sizes of their edges. Use mathematics to discover the ratio between length and width, and how this relates to the Fibonacci spiral.
#maths #a4 #doingmaths
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A thorough and precise explanation, excellent!

garethpeck
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Thank you for the explanation, very helpful 👍👍😁

deaxe
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I don't like that it's inversely proportional in name. As a kid I always got confused as to why A3 was bigger than A4. I also don't like that in cm their numbers are decimal. I'd prefer A4 to be 30x40cm.

alpacamale