Circle Radius and Area 2

Directions: Using the digits 0 to 9 at most one time each, fill in the boxes to create a circle with the smallest difference between the area estimates.

Hint

How many digits of precision does pi require for this problem?

Answer

The smallest difference between the area estimates is radius = 6 units and the area is between 98 and 123 square units

Source: Robert Kaplinsky

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