Do abbreviations or alternate spellings count?

Yes. Most quizzes allow common abbreviations, alternate spellings, and short forms. Try typing just the first few letters — if it matches, it will autofill.

North America

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US Circle Radius Population Challenge

Directions

The object of this quiz is to adjust each circle’s radius so it contains the target population shown at the right. When you click Start you will be shown a marker on a random US census tract (there are over 80K census tracts in the US). Also you will see an adjustable circle of radius 100 miles to start. Adjust the circle’s radius by dragging it until it contains the target number of people shown – this target will be between 100K and 25 million people. Then click submit. You are scored on how close your circle’s population is to the target. Circle population is tallied by totaling all census tracts (small census areas of average 4K population) within that circle.

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darin

3 hours ago

New quiz type – let me know your thoughts!