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Q.

The triangles ABC  and DEF  are similar.  If their areas are 100cm2  and 49cm2  respectively and BC=8.2cm , then EF=

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a

5.47 cm

b

5.74 cm

c

6.47 cm

d

6.74 cm

answer is B.

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Detailed Solution

[ABC][DEF]=BC2EF2

10049=BC2EF2

BCEF=1078.2EF=107

EF=8.2×710=5.74cm .

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