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

Which is the greatest of these rational numbers? 19/25 , 0.33, 0.680, 5/20 A) 0.33 B) 0.680 C) 19/25 D) 5/20
Name two types of extrusive igneous rocks that are considered frothy
Draw the major addition product of the acid-catalyzed hydration of 4-ethyl-3,3-dimethyl-1-hexene.
What mass of HBr (in g) would you need to dissolve a 2.7 −g pure iron bar on a padlock?
What factor does not contribute to the limited vegetation in the tundra? A) limited carbon dioxide supply B) nutrient poor soil C) frozen soil D) minimal rainfa
what is 5r^2-18=-9 help please
The lengths of the sides of a rectangle are in the ratio of 4:7. If the longer side is 31.5 in, find the width, the perimeter, and the area of this rectangle.
Draw A series of three pictures illustrating a waning moon
he developed the moveable type printing press
The Wifes Story: read lines 59-70. In the margin, explain what happens between thw father and child. Why does the narrator scold her child?