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[ATTACH=full]1546[/ATTACH]
[ATTACH=full]1547[/ATTACH]

Part (a)

(4/3)^4 = 256/81 = 3.160494 = agrees with pi by 1 decimal place.

Part (b)

227/ = 3.1422857 = agrees with pi by 2 decimal places.

Part (c)

355/113 = 3.141593 = agrees with pi by 5 decimal places.

Part (d)

(63/25)[(17 + 15•sqrt{5})/(7 + 15•sqrt{5})] = 3.1415926 = agrees with pi by 5 decimal places.

You say?

[QUOTE="nycmathguy, post: 1099780, member: 279"] [ATTACH=full]1546[/ATTACH] [ATTACH=full]1547[/ATTACH] Part (a) (4/3)^4 = 256/81 = 3.160494 = agrees with pi by 1 decimal place. Part (b) 227/ = 3.1422857 = agrees with pi by 2 decimal places. Part (c) 355/113 = 3.141593 = agrees with pi by 5 decimal places. Part (d) (63/25)[(17 + 15•sqrt{5})/(7 + 15•sqrt{5})] = 3.1415926 = agrees with pi by 5 decimal places. You say? [/QUOTE]