Answer:
1. DF = 3.26
2. EF = 2.445
Explanation:
It is not stated, but I assume triangle ABC is similar to triangle DEF.
With that assumption, then:
AB/DE = BC/EF = AC/DF
Now we substitute all the given numbers.
2/1.63 = 3/EF = 4/DF
Look at the first two fractions and solve for EF:
2/1.63 = 3/EF
2(EF) = 1.63 × 3
EF = 2.445
Look at the first and third fractions and solve for DF.
2/1.63 = 4/DF
2(DF) = 4 × 1.63
DF = 3.26