[中學] 高中數學一問
設角BAC=60度,P為其內部一點且AP=10,
又P對於AB、AC的對稱點分別為Q、R,則QR=?
拜託各位哩~~頭腦鈍鈍一直解不出來~~
(目前解到圓內接四邊形出現....)
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