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垂直於弦的直徑平分這條弦,並且平分弦所對應的兩條弧.(定理) 這個定理應該學過吧? 1、任何直徑都會把圓分為兩段相等長的弧. 2、(定理)=>;垂直於弦的直徑分別平分兩平行弦所對應的兩條弧 1&;2=>;“直徑所平分的兩弦”减去“直徑所平分兩平行弦所對應的兩條弧”等於剩下的弧即 ; ;圓的兩條平行弦所夾的弧 ; ;必定相等. 完畢 證明時記得自己加上字母比較好說明
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