Answer:
18.8495559 cm (use however many significant figures or decimal places you are told)
Explanation:
- if it is inside the square and touches the edges, then the diameter of the circle equals the length of the square's sides
- Square has equal length sides so the area is
- So if the area is the square of the same length, then the length is the square root of the area

- so the circle diameter is 6 cm