DeltaABC and DeltaDEF are equilateral tr...

`DeltaABC and DeltaDEF` are equilateral triangles. If `A(DeltaABC) :A(DeltaDEF)=1:2` and AB=4 , then what is the length of DE ?

A

`2sqrt(2)`

B

`4`

C

8

D

`4sqrt(2)`

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