The blue ellipse shown in the figure is defined by x 2 /36 + y 2 /81 = 1. Determine the equation of the two circles.

smaller circle: x 2 + y 2 = 36, larger circle: x 2 + y 2 = 81

smaller circle: x 2 + y 2 = 6, larger circle: x 2 + y 2 = 9

smaller circle: x 2 + y 2 = 3, larger circle: x 2 + y 2 = 4.5

smaller circle: x 2 + y 2 = 72, larger circle: x 2 + y 2 = 181

The blue ellipse shown in the figure is defined by...

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