Hey there! I'm happy to help!
The area of a circle is the radius squared multiplied by pi (we will use 3.14). We already have the area, so we will go backwards.
1441÷3.14≈458.9171975
We find the square root.
√458.9≈21.42235275
Now we have our approximate radius. The diameter is twice the radius.
21.42235275×2=42.8447055
I don't know exactly if they want you to round it or not, but the diameter is somewhere around there.
Have a wonderful day! :D