help me!在线等

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helpme!在线等helpme!在线等 helpme!在线等算出整个正方形面积减去四个三角形面积，然后，用勾股定理算出三角形斜边长作为中间圆的直径除2作为半径用圆的面积公式求出面积，用剩余

help me!在线等
help me!在线等

 

help me!在线等

算出整个正方形面积减去四个三角形面积，然后，用勾股定理算出三角形斜边长作为中间圆的直径除2作为半径用圆的面积公式求出面积，用剩余的面积减圆，答案就是了

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