四邊形有四個頂點。從中取三個,可作一圓。有四種取法,可作四圓。其中半徑最小,又能把第四點包在圓內的圓即為所求。
四邊形有四個頂點。從中取三個,可作一圓。有四種取法,可作四圓。其中半徑最小,又能把第四點包在圓內的圓即為所求。
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