YLL討論網

提供個較簡便的作法..

作圓O直徑CK
連CQ、KP
角CEQ=180度-角CEP=弧CP/2=角CKP
所以三角形CPK相似於三角形CQE
(AA相似：CPK=CQE、角CEQ=角CKP)
所以CP*CE=CK*CQ=2*CO*CQ=48

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