The Isle of Pi #1

In an undisclosed location off a natural island somewhere in the Pacific Ocean is a man-made island where we believe Col. Chaos is hiding.  This island is perfectly round.  It has a road all around the edge of the island and one that crosses through the center of the island.  At this center is a perfectly round building with a parking garage underneath so that you may travel from one side of the island to the other. (See map below.)

The area of the Isle of Pi is about 3.14 square kilometers.  How far is it from the bridge to the center of the garage that is also the center of the island?
a. 2 km
b. 1 km
c. There isn't enough information.

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