A rectangular parking lot is 80m by 50m.How much less,in sqa

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A rectangular parking lot is 80m by 50m.How much less,in sqare meters ,is its area than that of a
A rectangular parkinglot is 80m by 50m.How much less,in sqare meters ,is its area than that of a sqareparking lot with the same perimeter?

一个80米长,50米宽的长方形停车场,比起同样周长的一个正方形停车场,其面积减少了几平方米? 答案是 225 平方米.
再问：过程是什么，急急急急，下午就要交。你还会这题吗？ Andy wants to make circular flower beds that will be outlinedwith 4 meter lengths of plastic edging . What is the radius of the biggest circularflower bed he can make with one length of plastic edging?Give your answer to thenearest tenth of a meter.
再答：长方形： 80 X 50 = 400 sq. meters 正方形：周长 80 + 50 +80 +50 = 260 meters. 单边长度： 260/ 4 = 65 meters 面积： 65 x 65 = 4225 sq. meters. 4225 - 4000 = 225 sq. meters

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