the answer to this problem is choice 4 because
[tex]ab = 6 \: \: and \: \: ac = 8[/tex]
so we need to find the answer choice such that we can set up a proportion of sides that are equal
[tex] \frac{ab}{de} = \frac{ac}{df} [/tex]
plugging in choice we find choice 4 is correct because
[tex] \frac{15}{6} = \frac{20}{8} [/tex]
simplify and get
[tex]2.5 = 2.5[/tex]
this would mean the sides are similar of both triangles. now we can consider the angle were given and justify that both triangles are similar under choice 4
