直線與圓
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一組曲線 F 的垂直軌跡 (orthogonal trajectory) ,是指一條 曲線在與 F 中的曲線相交時,在交點相交的角度為直角。如
如圖,若正方形 ABCD 的邊長為 8 公分,一圓過 A、D 兩點且與 BC 相切,則此圓的直徑為ˉˉ ˉˉ公分。... 如圖,已知圓 O
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定義 7.4-1 內接與外切.
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