pi is the square root of ten
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Incorrect. Pi is the mathematical ratio between the circumference and the diameter of a circle. Coincidentally, it is also the ratio between the area of a circle and the square of its radius.
The square root to 10 is ~3.16227766, while Pi is ~3.1415926535897932
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pi = circumference/diameter
Archimedes made pi more precise
pi was not made - it is not a human artefact. The ratio of the circumference of a circle to its diameter exists independent of human existence.
Pi Day, celebrated on 14 March every year, was made official in 2009. See the related weblink.
Pi