Cho tam giac ABC co 3 goc nhon (AB<AC) noi tiep (O). Ve duong kinh AD. qua B ke duong thang vuong goc voi AD tai P,no cat AC tai Q .Ke BH vuong goc voi AC (H thuoc AC ).goi M la trung diem cua BC a,CM: CDPQ la tu giac noi tiep .b,CM:\(\widehat{MCH}\)= \(\widehat{ABP}\)c, CM: 3 diem H, P ,M thang hang...
Đọc tiếp
Cho tam giac ABC co 3 goc nhon (AB<AC) noi tiep (O). Ve duong kinh AD. qua B ke duong thang vuong goc voi AD tai P,no cat AC tai Q .Ke BH vuong goc voi AC (H thuoc AC ).goi M la trung diem cua BC
a,CM: CDPQ la tu giac noi tiep .
b,CM:\(\widehat{MCH}\)= \(\widehat{ABP}\)
c, CM: 3 diem H, P ,M thang hang va \(\frac{BC}{HP}\)_\(\frac{HC}{HQ}\)=1
