Answer: 25
Explanation:
2 is the formula for a circle (in this case, a circular rug)
and we would set it equal to 84 (since we are trying to get the biggest size possible).
We would isolate r so that r^2 = 84/, and r would be around 5.17219.
If we were going by rounding 5 would be the largest radius possible and the radius would be 25 or about 78.5398 units.