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.