the circumference
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If 5 circles are inside the one circle, then the periphery is of the one circle. The periphery depends on the diameter of the one circle. The number of circles inside won't make any difference.
yes , there is a outer circle near the goal from where the goal is to be taken.
x^2+y^2=36
The outer circle of a football field is the border of the field. When the players step outside of the border, the play stops.
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)