已知一张矩形纸片OACB,将该纸片放置在平面直角坐标系中,点A(11

已知一张矩形纸片OACB,将该纸片放置在平面直角坐标系中,点A110),B06),点PBC边上的动点(点P不与点BC重合),经过点OP折叠该纸片,得点B′和折痕OP.设BPt

1)如图①,当∠BOP30°时,求点P的坐标;

2)如图②,经过点P再次折叠纸片,使点C 落在直线PB′上,得点C′和折痕PQ,若AQm,试用含有t的式子表示m

3)在(2)的条件下,当点C′恰好落在边OA上时,求点P的坐标。(直接写出结果即可)

                                  

 
 


答案

解:(1)根据题意,有∠OBP = 90°,OB = 6

RtOBP中,由∠BOP = 30°,BP =t,得OP2t.

OP 2 OB 2+BP 2,即(2t2 62+t 2,解得t1t2=-(舍去).

∴点P的坐标为( 6).

2)∵△OBP,△QCP分别是由△OBP,△QCP折叠得到的,

∴△OBP ≌ △OBP,△QCP ≌ △QCP.

∴∠OPB=∠OPB,∠QPC=∠QPC.

∵∠OPB+∠OPB +∠QPC+∠QPC180°∴∠OPB +∠QPC90°.

∵∠BOP +OPB90°,∴∠BOP=∠CPQ.

又∵∠OBP=∠C = 90°,∴△OBP∽△PCQ..

由题意知,BPtAQmBC11AC6,则PC11tCQ6m

0t11.

3)点P的坐标为(6)或(6.

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