Question 1208412
.


This phrase from your post

<pre>
    "the circle surrounding the pool is the deck"
</pre>

is incorrect.


A correct version is 

<pre>
    "the  <U>ring</U>  surrounding the pool is the deck."
</pre>


To answer first question, you should subtract the area of the smaller circle from the area of the greater circle.


Do you see the difference ?



To your second question, the answer is "Yes".



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As I see from your post, you treat words &nbsp;(&nbsp;terms &nbsp;!&nbsp;) &nbsp;very carelessly. 
Be more accurate with it &nbsp;(&nbsp;!&nbsp;)