Answer:
20.32
Step-by-step explanation:
ANSWER
See below
EXPLANATION
We want to verify that,

To verify this identity, we can take the left hand side simplify it to get the right hand side or vice versa.





We now expand the right hand side to get:

It is 255 cm^2
This is a very basic area problem. You should try refreshing on some of your multiplication and addition skills. Try reading patterns, maybe. Also learning geometric proofs is VITAL.
The correct answer for this problem is A.