接原帖,需要用尺規作圖找到D,使得。 PC/CQ=DC/CO
作CR=CO,過P作QR的平行線得S。取DC=SC..
三角形PCS與三角形QCR相似,PC/CQ=SC/CR. 即 PC/CQ=DC/CO
接原帖,需要用尺規作圖找到D,使得。 PC/CQ=DC/CO
作CR=CO,過P作QR的平行線得S。取DC=SC..
三角形PCS與三角形QCR相似,PC/CQ=SC/CR. 即 PC/CQ=DC/CO
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