Question

In triunghiul ABC, M apartine (AB) si N apartine (AC) iar MN||BC. DACA AM=5cm ,AN=6cm , MN=7cm si BC=21cm , aflati lungimea segmentelor AB,AC,MB,NC
URGENT!! CINE DA SI DESEN II DAU CORONITA!!!!!

Answer 1

Răspuns:

MN ll BC  => AMN asemenea cu ABC

=>AM/AB =MN/BC=AN/AC

5/5+MB =7/21

5*21 =7(5+MB)

105 =35+7MB

7MB =105-35 =70

MB =7 cm

AB=5+7 =12 cm

AN/AN+NC=MN/BC

6/6+NC =7/21

6*21 =7(6+NC

126=42+7NC

7NC=126-42=84

NC =12 cm

AC =6+12 =18 cm

Explicație pas cu pas: