MATHS

2 x 1.4/2 x 3.14X6x100
=2638.937829
=2640m(corr. to 3 sign fig)

2007-04-18 17:23:19 補充：
= =點解會係840m ge??前輪唔係車輪果d咩??唔係應該計周界架咩??唔通我錯左@@?如果係錯左咁就sorry la><可能我理解錯左

圓周公式
2兀r = 2 * 3.14 * 半徑

2 * 0.7 * 3.1415 * 6 (每分6周) * 100 (100分鐘)
=2638.86 M

First calculate the circumference of the wheel:
1.4 x 3.1416 (m) (diameter x Pi)
= 4.39824 m
Then calculate the distance traveled in a minute:
4.39824 x 6 (m) (circumference x 周)
= 26.38944 m
Then calculate the distance traveled in 100 minutes:
26.38944 x 100 (m) (distance traveled per minute x 100 minutes)
= 2638.944 m

So the whole statement should be:
1.4 x 3.1416 x 6 x 100 (m)

The answer depends on what you take Pi as, you may take Pi as 22/7 or 3.14 or more significant figures.

2007-04-18 17:26:36 補充：
The answer can't be 840... The wheel is a circle, so you must include the Pi in your steps...

它100分鐘前進了：
(1.4 x 3.14 x 6 x 100)m
=(4.396 x 6 x 100)m
=(26.376 x 100)m
=2637.6m

給你直徑的資料：

直徑是穿過圓心連接圓上兩點的線段，用d表示。直徑的兩個端點在圓上，圓心是直徑的中點。直徑將圓分為面積相等的兩部分（每一個部分成為一個半圓）。在同一個圓里，直徑等於半徑（r）的二倍。

圓的周長（C）與其直徑的比值為π，即圓周率。

輪的周界=1.4(22/7)
=4.4

(100x6x4.4)
=2640m
它100分鐘前進了2640m。

1.4 x(6x100)
=1.4 x 600
=840
∴它100分鐘前進了840m

2007-04-18 17:24:03 補充：
錯左..sorry1.4x兀x(6x100)=1.4 x 3.14 x 600=2637.6∴它100分鐘前進了2637.6m 禁計數機準d!

840m呀