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A stone was dropped into a still pond and produced concentric circular ripples on the surface of the water. The radius of the outermost ripple increased at a constant rate of $$x$$ feet per second. If the area of the circular region enclosed by the outermost ripple was 400π square feet 10 seconds after the stone hit the water, what is the value of $$x$$?
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· 相关考点
4.5.2 圆的周长与面积
4.5.2 圆的周长与面积
以上解析由 考满分老师提供。
