有一道PS题看了半天,说的是the longest possible rigid rod can fit into a right circular cylinder is 25 inch . and the depth of the cylinder is 20 inch. 问cylinder 的体积in terms of cubic inch.答案是1125pi 先用勾股定理求出底面园的直径然后再用体积公式算
为什么说用勾股定理啊? 实在是不理解
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