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A thin piece of wire 40 meters long is cut into two pieces. One piece is used to form a circle with radius r, and the other is used to form a square. No wire is left over. Which of the following represents the total area, in square meters, of the circular and the square regions in terms of r?
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一根线被剪成两段 一根用来围成一个圈 一根用来围成一个正方形，没有剩余。
圆的周长=2πR 于是，用来围成正方形的线的长度=40-2πr
正方形边长=（40-2πr）/4 正方形面积=（10-1/2πr)^2
所以，圆和正方形的面积和=πr^2+ (10- ½ πr)^2
默默
圆的周长 40-圆的周长/4=边长 边长平方=正方形面积
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2018-04-24 13:00:30
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