Question

2)ΔABC echilateral
AB=8 cm
________
mediana BD?

Answer 1

M = L×rad3/2 = 8rad3/2 = 4rad3 cm

Answer 2

$\text{Intr-un triunghi echilateral, mediana este si inaltime.} \\ \text{Formula inaltimii in triunghiul echilateral} = \boxed{\frac{l \sqrt{3} }{2}} \\ \\ BD= \frac{AB \sqrt{3} }{2} \\ BD= \frac{8 \sqrt{3} }{2} \\ \boxed{BD=4 \sqrt{3} }$