Seven over teo is a number (3 1/2 or 3.5) and has no radius. Only a circle has a radius.
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Radius = 1/2 of diameter = 7/2 = 3.5 inches
Diameter divided by 2 equals radius r=d/2 For example, if the radius was 3.5, the diameter would be 7.
Multiply 2 times pi (3.14 OR 22/7) times the radius 2(pi)r
It is (x + 7)2 + (y + 2)2 = 42
It is: (x-2)^2 +(y-7)^2 = 16