共50条信息
如图,\(PA\),\(PB\)分别与\(⊙O\)相切于\(A\)、\(B\)两点,点\(C\)为劣弧\(AB\)上任意一点,过点\(C\)的切线分别交\(AP\),\(BP\)于\(D\),\(E\)两点\(.\)若\(AP=8\),则\(\triangle PDE\)的周长为_________.
如图,\(PA\),\(PB\)分别与\(⊙O\)相切于\(A\),\(B\)两点,\(PO\)与\(AB\)相交于点\(C\),\(PA=6\),\(∠APB=60^{\circ}\),则\(OC\)的长为_____.
如图,在\(\triangle ABC\)中,\(∠C=90^{\circ}\),以\(BC\)为直径的\(⊙O\)交\(AB\)于点\(D\),\(⊙O\)的切线\(DE\)交\(AC\)于点\(E\).
\((1)\)求证:\(E\)是\(AC\)中点;
\((2)\)若\(AB=10\),\(BC=6\),连接\(CD\),\(OE\),交点为\(F\),求\(OF\)的长.
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