Circles have diameters, so we will assume from your question that it is a circular flower bed.
Square feet is a measure of area. Cubed feet is a measure of volume.
You need the area of the flower bed that has a diameter of 13 feet.
To find the area of a circle you use the formula Area = pi * radius squared
Pi is approximately 3.14
The radius of a circle is one half of the diameter of a circle. In your case 13/2 = 6.5
A = pi * r2 A = 3.14 * (6.5)2
A = 132.665 square feet
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There are about 38.48 square feet in a 7' diameter circle
1256.64 square feet
Approx 17.7 square feet.
3.14159265 square feet.
Area = 3.976 square feet