一个数学题没看懂
a circular flow bed of radius feet is surrounded by a circular walk of which r/2 feet,question
(a) the area of flow bed
(b) the area of walk ]q6QM q B
有谁能解释一下么,谢谢了 [font=Helvetica][size=12px]设想**圈。。。[/size][/font] 设想**圈。。。r7a Ry([5H b
ps.为什么字变成＊呢？？奇怪。 jesus!!! Wtf is wrong with Chinese character input???/u hZMz6W;`_
Basically its a bigger circle (representing the walking path) outside of a central circle. So the area of the walk would be pi*(r+r/2)^2-pi*r^2, whereas the area of the flow bed would be pi*r^2.
回复 4# jsqzhu 的帖子
哦，我知道了，中间是个花坛，边上是人行道，原来看了半天没懂，谢谢罗， 3x"@ Z C3CXl2R [ ^ EY'Ro7}差不多这个意思
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