nguyenhoangkhaianh11 nguyenhoangkhaianh11
  • 03-08-2021
  • Mathematics
contestada

cho tam giác ABC cân tại A trung tuyến AM.Biết BC=6cm,AM=4cm .Tính độ dài các cạnh AB và AC

Respuesta :

vyvp999
vyvp999 vyvp999
  • 03-08-2021

Vì tam giác ABC cân tại A (gt) mà AM là đg trung tuyến nên AM đồng thời là đg cao của t/giác đó:

AM là trung tuyến của t/giác ABC nên M là trung điểm BC:

=> BM =BC/2 =6:2=3(cm)

Xét tam giác AMB vuông tại M

AB^2 =AM^2+BM^2 ( theo định lý Py-ta -go)

Answer Link

Otras preguntas

In which decade did the first airplane ride with passengers occur?
a lack of Hungarian representatives in the government and ______ lead to uprisings against Austrian rule
Does technology always follow science
One reason why Germany did NOT become a strong unified state during the Middle Ages was because __________. a. t was ruled by foreign rather than native princes
Although the Anti-Federalists lost their main goal, what important task did they accomplish?
A certificate of deposit pays a higher interest rate than a savings account because the money is
In the Cuban Missile Crisis, President Kennedy demanded the removal of Soviet missiles from ____________. a. Cuba c. Canada b. the Soviet Union d. America
What is the antimatter equivalent of the electron? a. neutrino b. positron c. lepton d. fermion
How did Andrew Johnson's behavior in office influence the events of the Reconstruction era? a. Johnson's behavior and use of the veto prevented Republicans from
one side of a square is 7cm what is the area