Question

   ABC DEF ~ and their areas be, respectively, 64 cm2 and 121 cm2 . If EF = 15.4 cm, the value of BC is. (a) 11.2 cm (b) 15.4 cm (c) 6.4 cm (d) none of these​

Answer 1

Answer:

Solution

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△ABC∼△DEF

⟹

Ar(ΔDEF)

Ar(ΔABC)

=(

EF

BC

)

2

121

64

=(

15.4

BC

)

2

BC=

121

64

×15.4

BC=

11

8

×15.4=11.2cm