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2)ΔABC echilateral
AB=8 cm
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mediana BD?


Răspuns :

M = L×rad3/2 = 8rad3/2 = 4rad3 cm
[tex]\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} }[/tex]