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来自维基百科,自由的百科全书
在幾何學裏,同心的物體的中心或中心軸都在同一位置。圓圈、圓球、圓柱、圓環,都可以是同心的。稱同心的圓圈為同心圓,同心的圓球為同心球,同心的圓柱為同心柱,同心的圓環為同心環。
兩個同心圓的面積比是
容積比是
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