The center is (-1, -2) and the radius of the circle is 5.
<h3>What is the equation of a circle?</h3>
The circle equation formula refers to the equation of a circle which represents the center-radius form of the circle.
A circle can be represented as;

Where; h and k are the center of the circle r is the radius of the circle.
The given equation of the circle is;

Comparing both the equations;

Hence, the center is (-1, -2) and the radius of the circle is 5.
Learn more about circle here;
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52 ft
The missing side is 5ft because 11-6 is the remaining side length.
11+5+6+8+7+15=52
Steps to my answer:
18x-9xy+12x
Add similar elements together, your answer comes out to be:
=30x-9xy
I hope this is what you were looking for! :)