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One-fifth of the area of a triangle ABC ...

One-fifth of the area of a triangle ABC is cut off by a line DE drawn parallel to BC such that D is on AB and E is on AC. If BC = 10 cm, then what is DE equal to ?

A

`sqrt(5) cm`

B

`2sqrt(5) cm`

C

`3sqrt(5) cm`

D

`4 sqrt(5) cm`

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