how pi came

Asked by chanti PANCHADHARA | 10th Jun, 2013, 08:24: PM

Expert Answer:

The early history of N (pi) from textual sources roughly parallels the development of mathematics as a whole.

Early evidence points toward use of an approximation for the length of 'circumference' with respect to its 'radius' (~ 3 1/7) in the designs of the pyramids in Egypt. The Great Pyramid (2500 BC) was built with a perimeter of 1760 royal cubits (1 royal cubit ~ 20.64 inches or 525 mm) and a height of 280 cubits; the ratio 1760/280 ~ 2? ~ 6.29. (N ~ 3.14) 

Pi was discovered by the Greeks by a process called exhaustion. They observed that any polygon could be divided into triangles whose areas could be combined to get the area of the shape, so they tried the same thing with circles. They then factored in the radius of the circle, and they found pi. These triangles can theoretically get infinitely smaller, which is why pi is an irrational number.

Answered by  | 11th Jun, 2013, 02:35: AM

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