Archimedes approximated the area of a circle based on the area of a regular polygon inscribed within the circle and the area of a regular polygon within which the circle was circumscribed. One of the greatest mathematicians of the world, Archimedes used the Pythagorean Theorem to find the areas of two polygons. The first calculation of pi was carried out by Archimedes of Syracuse (287-212 B.C.). There is even a biblical verse where it appears pi was approximated:Īnd he made a molten sea, ten cubits from the one brim to the other: it was round all about, and his height was five cubits: and a line of thirty cubits did compass it about. - I Kings 7:23 (King James Version) In this document, the Egyptians calculated the area of a circle by a formula giving pi an approximate value of 3.1605. The ancient Egyptians were making similar discoveries, as evidenced by the Rhind Papyrus of 1650 B.C. A tablet from somewhere between 1900-1680 B.C. Pi has been known for nearly 4,000 years and was discovered by ancient Babylonians. The website has pi listed to the first million digits.
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