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几何学定理 来自维基百科,自由的百科全书
一条直线,在下列5条中只要具备其中任意两条作为条件,就可以推出其他三条结论。称为“知二推三”。
垂直于弦(AC)的直径(BE)平分这条弦,并且平分这条弦所对的弧()。
另有垂径定理推论3条如下:[2]
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