1000000000000x169000000000000000000 00000000000000000000000000000000000 66666666e55555555555555555555555555 55555555555555555555555555555555555 55555555555555555555555555555555555 55555555555555+33333333333333333333 33333333333333333333333444444444444 x400

oh god my calculator can't handle this

Step-by-step explanation:

so your answer is 3, take it or leave it

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.