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题1(2008年浙江卷·理10)如图1,AB是平面α的斜线段,A为斜足,若点P在平面α内运动,使得△ABP的面积为定值,则动点P的轨迹是
As shown in Figure 1, AB is a slash segment of plane α, A is a skewed foot. If point P moves in plane α, so that the area of △ ABP is a fixed value, then point P The track is