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DeltaABC and DeltaDEF are equlateral tri...

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

A

`2sqrt(2)`

B

4

C

8

D

`4sqrt(2)`

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