救救我!!

[size=7][color=Red]做晒有100-200個i-see錢!![/color][/size]





希望有人可以幫下我啦
我今日之內要搞點丫
但我又未學又唔識做
help!!

The following is a method to estimate value of ( 我唔識打,,不過佢係等如3.14....or 22/7 ):
In a circle, draw a regular n-gon. As the value of n increases, its perimeter gerts to the circumterence
of the circle. The figure shows a circle with radius 1cm and centre at O. A regular n-gon P1P2...Pn-1 is drawn in
the circle. Given that if ∠P1P2= (類似x嘅物體), then P1P2=2sin x/2   ( 呢個唔係x,,不過類似啦,同前面一樣 )

ai.If n=10, find the perimeter of the regular 10-gon, correct to the nearest 0.00001cm.
ii. Using the result in (ai), find the approximate value of ( 我唔識打,,不過佢係等如3.14....or 22/7 ), correct to 5  
significant figures.
bi. If n=20, find the perimeter of the regular 20-gon, correct to the nearest 0.00001cm.
ii.Using to result in (bi), find the approximate value ( 我唔識打,,不過佢係等如3.14....or 22/7 ), correct to the nearest 0.00001cm,
ci. If n=100, find the perimeter of the regular 100-gon, correct to the nearest 0.00001cm.
  ii. Using the result in (ci), find the approximate value ( 我唔識打,,不過佢係等如3.14....or 22/7 ), correct to 5
significant figures.
di. If n=200,find the perimeter of the regular 200-gon , correct to the nearest 0.00001cm.
ii. Using the result in (di)m find the approximate value of ( 我唔識打,,不過佢係等如3.14....or 22/7 ), correct to 5
significant figures.

[[i] 本帖最後由 vs17 於 2008-8-23 03:43 PM 編輯 [/i]]