3.28 Circular city, revisited again Suppose we modify the previous example so that travel from the outer point to the inner point, when it reaches the inner circle (say of radius R2 if R2 < R1), proceeds from that point either along an arc of radius R2 (as in Problem 3.27) or through the city center along two radial routes directly to the possiblities are shown in Figure P3.28.

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