Question

∆ABC and ∆DEF are equilateral triangles

Answer 1

Step-by-step explanation:

Consider ,  A(ΔABC):A(ΔDEF) = 1 :2 

⇒A(ΔDEF)A(ΔABC)=21

⇒DE2AB2=21

⇒DE2=2AB2

⇒DE2=2×42[∴AB=4]

⇒DE=32

⇒DE=42