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Given that triangle DEF ~ triangle ABC, ...

Given that `triangle DEF ~ triangle ABC`, If the area of `triangle ABC` is `9 cm^2` and that of `triangle DEF=12 cm^2`, BC=2.1 cm, then the length of EF is :
दिया हुआ है की, `triangle DEF ~ triangle ABC`, यदि `triangle ABC` का क्षेत्रफल `9 cm^2` है और `triangle DEF=12 cm^2`,BC = 2.1 सेमी है, तो EF की लंबाई है?

A

`(8sqrt3)/(5)`cm

B

`(3sqrt7)/(5)`cm

C

`(4sqrt7)/(5)`cm

D

`(7sqrt3)/(5)`cm

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