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题目内容
The surface area of a sphere of radius r is equal to $$4πr^{2}$$. Sphere K has radius k, and sphere N has radius n. If the ratio of the surface area of sphere K to the surface area of sphere N is 9 to 4, what is the ratio of k to n?
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· 相关考点
4.6.4 圆球体 2.5.1 单位换算
[相关术语] • sphere 球体 [核心考点] • 球体的体积公式：V=(4/3)·πr^3
2.5.1 单位换算
以上解析由 考满分老师提供。
