yes , there is a outer circle near the goal from where the goal is to be taken.
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The outer circle of a football field is the border of the field. When the players step outside of the border, the play stops.
x^2+y^2=36
because in 1945, football players squished a football once and decided to name it a circle
The radius of the inner circle is sqrt(9) = 3. The radius of the outer circle is therefore 3*3 = 9. The equation for the outer circle is then x^2 + y^2 = 9^2 = 81. (This is an application of Pythagoras' theorem a^2 + b^2 = c^2 in a right-angled triangle by the way)
If the radius of a circle is twice the diameter. The outer diameter of a circle the size of a circle. 32.25 mm = 1.27 inches