neu hai duong thang a va b phan biet cung vuong goc voi duong thang MN thi chung......voi nhau
A.song song
B.vuong goc
C.cat nhau
D.trung nhau
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câu a
Xét tam giác MHP và DPH có
HP chung (gt)
MHP = HPD = 900
DHP =MPH ( HD // MP có hai góc so le trg bằng nhau MHP=HPD)
=>> MHP = DPH(g.c.g)
ta có MHP = DPH = 90o(gt)
mà hai góc trên nằm ở vị trí so le trg
nên HD // MP
(mà câu a anh cug nói rồi đó)
neu hai duong thang a va b phan biet cung vuong goc voi duong thang MN thi chung......voi nhau
A.song song
B.vuong goc
C.cat nhau
D.trung nhau
A nhé
-HT-