Approximations for PI
Many different approximations for the actual value of pi have been proposed and used. For each of the following, determine their accuracy to the nearest percent:
 256/81 [Egyptian value, 1700 BC]
 22/7 [Egyption value, 1000 BC]
 3+10/71 < Pi < 3+1/7 [Archimedes' approximation of a circle by a regular 96gon]
 SQRT(10) [Ch'ang Hong, China, 125 AD]
 31^{(1/3)}
 666/212
 355/113 Ch'ungchih, China, 470 AD]
 104348/33215
 One of the roots of 9x^{4}240x^{2}+1492=0
