The answer would be 89.90558242
If u round it off, the answer will be 90

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A circle is a collection of points all of which are on the circumference of the circle. If you use algebra and (x-h)^2 + (y-k)^2 = r^2 and the info contained in the coordinates (x,y) of each city, you can find h, k and r. Then r is the (equal) distance between each city and the center of the circle, where the new tower will be built.
Answer:
7.2*10^3.
7,200 in scientific notation, is 7.2*10^3