如图,长方形ABCD中,AB=10cm,BC=8cm,点E是CD的中点,动点P从A点出发

如图,长方形ABCD中,AB=10cmBC=8cm,点ECD的中点,动点PA点出发,以每秒2cm的速度沿ABCE运动,最终到达点E.若点P运动的时间为x秒,那么当x=      时,APE的面积等于32

 

答案

 46.6

【考点】三角形的面积;矩形的性质.

【分析】分为三种情况:画出图形,根据三角形的面积求出每种情况即可.

【解答】解:如图1

PAB上时,

∵△APE的面积等于32

×2x8=32

解得:x=4

PBC上时,

∵△APE的面积等于32

S矩形ABCDSCPESADESABP=32

10×810+82x×5×8×5×10×2x10=32

解得:x=6.6

PCE上时,

10+8+52x×8=32

解得:x=7.510+8+5),此时不符合;

故答案为:46.6

 

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