15 + 16 + 15 + 8 + 6 = 60 divided by 5 = 12
Answer is D
Since you want to use the SAS theorem, you must find sides that are either side of angles BAC and DAE. You have already made use of sides AE and AC, so the other sides you need to choose are AB and AD. The appropriate relationship for similarity is ...
... AD = 2AB
since you want the sides of triangle ADE to be twice then length of those in triangle ABC.
Greatest common factor is 1 for the first one and the second one is also 1
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