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triangle ABC ~ triangle EDF and ar(tria...

`triangle ABC ~ triangle EDF` and `ar(triangle ABC) : ar(triangle DEF) = 1:4`. If AB =7cm, BC = 8 cm and CA = 9 cm, then DF is equal to :
`triangle ABC ~ triangle EDF` और `ar (triangle ABC) : ar(triangle DEF) = 1: 4` है। यदि AB = 7 सेमी, BC = 8 सेमी तथा CA = 9 सेमी है, तो DF का मान किसके बराबर होगा?

A

8 cm

B

16 cm

C

18 cm

D

14 cm

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