HI Barbara,
Boy oh boy was it fun to research the answer to this question for you. While I couldn't find the exact square footage of Disney's Art of Animation Resort Hotel, you can imagine a resort with a pool that's over 11,000 square feet would be vast! You didn't specify if you would be staying at The Lion King, Cars, or Finding Nemo Family Suites, but The Lion King family suites would be the closest to The Little Mermaid Buildings. Again, I don't have the exact distance apart, but if you view the
map of Art of Animation Resort, you can see that these two sections are located near each other.
I hope this helps you with your vacation planning, Barbara. If you have any other questions, please feel free to ask us at any time.
Have a fantastical Disney day!