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来自维基百科,自由的百科全书
假设, , 与是三角形的三个内角,, , 与是与之对应的三个对边,若
还有
总而言之,余切定理就是:某个角一半的余切等于半周长减去这个角所对的边长再除以三角形的内切圆半径。
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