有趣的數學???

2008-05-31 7:37 am
一棵大樹的樹幹是圓柱體,樹幹的直徑為9.6m.若每位成年人把兩臂張開後,可伸展的距離為1.5m,問最少需要多少位成年人才能把樹幹圍着?

回答 (3)

2008-05-31 8:05 am
✔ 最佳答案
2 x 3.14 x(9.6/2)
=30.15928947.......

30.15928947 / 1.5
=20.10619298

所以要21 個成年人
2008-05-31 7:43 am
the diameter of the tree = 9.6m
circumference of the tree = 9.6 x pi
the number of adult needed to surround the tree trunk by their arms
= 9.6pi / 1.5
= 20.10619298....
Thus, the minimum no. of adults needed = 21//
2008-05-31 7:42 am
21個人。
9.6 x 3.14 = 30.144
30.144 ÷ 1.5 = 20.096
要21人才可以。


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