We must find the proportion between corresponding sides to check if they are similar. Doing so, we have:
AK / RE = 24/16 = 3/2 (Simplifying)
AP / CE = 18/12 = 3/2 (Simplifying)
KP / CE = 21/14 = 3/2 (Simplifying)
We can see that they have the same proportion, so they are similar.
The similarity statement would be: AKP ∼REC