Question

In triunghiul ABC, DE || AC ; BE=6cm ; EC= 8cm ; D apartine AB ; E apartine BC. Aflati AD/AB.

Answer 1

DE//AC⇒$\frac{BD}{BA} = \frac{BE}{BC}$
$\frac{BE}{BC} = \frac{6}{6+8} = \frac{6}{14} = \frac{3}{7} =K$
$\frac{AD}{AB}<strong> </strong>= \frac{EC}{CB} = \frac{8}{14} = \frac{4}{7}$
$\frac{AD}{AB} = \frac{4}{7}$