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.
![](https://www.openmiddle.com/wp-content/uploads/2021/05/circle.png)
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