圖片參考:http://imgcld.yimg.com/8/n/HA07015327/o/20121027161132.jpg
2.在圖中,ABCD是一個正方形。M和N分別是AB和BC上的點,使BM=BN。在MC 上取一點P,使BP ⊥ MC 。證明PD ⊥ PN。
圖片參考:http://imgcld.yimg.com/8/n/HA07015327/o/20121027161351.jpg
更新1:
唔明: PM : (√10/2) = DE : DA = 1 : 3 PM = √10/6 為何 ∠BCM = ∠PBM
更新2:
∠BCM = ∠PBM 已明白 why △NBP ~ △DCP
更新3:
why: PM : (√10/2) = DE : DA = 1 : 3 PM = √10/6
更新4:
BP/BM = PC/BC because △BPM ~ △CPB but why △BPM ~ △CPB,which are the 3 angles of the △BPM ~ △CPB of reasons??please explain it﹗﹗ Also can I say BP/BM = PC/BC because △BPM ~ △CBM??? please help me to explain it﹗thanks﹗