Question

（本題10分）（1）如圖1，已知∠AOB，OA＝OB，點E在OB邊上，四邊形AEBF 是平行四邊形，請你只用無刻度的直尺在圖中畫出∠AOB的平分線．（保留作圖痕跡，不要求寫作法）

（2）如圖2，在10×10的正方形網格中，點A（0，0）、B（5，0）、C（3，6）、D（－1，3），

①依次連結A、B、C、D四點得到四邊形ABCD，四邊形ABCD的形狀是     ▲     .

②在x軸上找一點P，使得△PCD的周長最短（直接畫出圖形，不要求寫作法）；

此時，點P的坐標為     ▲     ，最短周長為     ▲     .

 

Answer 1

【答案】

解：（1）如圖所示；················································································· 2分

（2）①等腰梯形；·············································································· 4分

②P（，0）·············································································· 6分

（其中畫圖正確得2分）··················································· 10分

 

 

 

 

 

 

 

 

 

【解析】略