Answer:
The answer is 58 cm.
Explanation:
In order to determine the diameter of a circle, we need to know about the formula of the area of a circle. The area just depends on the radius of circle.
I have attached an image that shows a circle and its formula. Also we have to know that the diameter of a circle is twice its radius.
Then:
R=radius of the circle
D=diameter of the circle
A=area of the circle

Therefore:

Finally, the diameter of the circle is 58 cm.