It was first used to find the circumferential of a circle as far as i know.
A keyboard
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The first digit of pi is 3, the first decimal is 1. Pi ≈ 3.14 The first fifty digits are 3.1415926535897932384626433832795028841971693993751
fertilizers explosives neat chemistry experiments.
sulfur is used for gun powder and protein
it is used for making paper in ancient Egypt
The Richter scale and Magnitude
Pi was first used by the Babylonians and Egyptians.
The first time the symbol Pi was first used for Pi was in ancient Greece in their numbers. The symbol "π" was number 80 in Greece.
The first numbers of pi is 3.14159265358979323846264338327950288419716939937510 58209749445923078164062862089986280348253421170679
3.14159265358979323846 are the first 20 digits of pi.
The first eleven digits of pi are:3.141592653