The geographic center of a region (county, state, country) is defined to be the centroid of that region. Use the map in Figure 24 to approximate the geographic center of Illinois. All distances are approximate and are in miles. The given east-west distances are 20 miles apart. You will also need the distances between the eastern boundary of the state and the line running north/south that forms the eastern boundary of the state. Beginning with the northernmost dimensions, the distances are 13 and 10 miles, and beginning with the southernmost dimensions, the distances are 85 (at the southern tip), 50,30,25,15, and 10 miles. Assume that all other east/west dimensions are measured from the easternmost boundary.

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