Cho tam giac ABC vuong tai A(AC>AB), duong cao AH trung tuyen AM.Cho BC=26cm, AH=12cm. C/m:
a) tinh HM va AB;
b) ve BN vuong goc AM tai N, BN cat AH tai I.C/m: BN=AH,
c) goi K la giao diem cua AB.C/m: M,I,K thang hang,
d) cho goc AMB=50 do tinh goc BIH va goc HIN,
e) c/m: IC<AC,
f) AM catt CK tai G.C/m: BG di qua trung diem AC
h) C/m: goc BGC la goc tu
mn giúp e vs ạ
Loga
Sinh Học lớp 12
