如题所述
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当四边形ABCD为梯形时面积最小∵AB∥CD,∴△AOB∽△COD,∴OA/OC=OB/OD=√(S△AOB/S△COD)=√(4/9)=2/3∴S△AOB/S△BOC=OA/OC=2/3,∴△BOC=6,同理S△AOD=6,∴S四边形ABCD=25