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 極值》 |
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範例 47：從力學觀點來看費瑪點 |
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如何從力學觀點求得三頂點距離最小的點？
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《 解答 》 |
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 何時最小？
以A、B、C都是銳角來說明，假想A、B、C是桌面上的三個點，從一個三結繩各懸一公斤的物體，
三繩結於Q點，由於繩長固定，因此當 最小時，垂下的部分最長，位能最小，而達到平衡。
平衡時在Q點有三個各一公斤的力，大小相等，合力為零，因此彼此之間的夾角是 。
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About This
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