13ft!
169
13ft equates to approximately 0.0025 mile; 1/400 mile.
The surface area of a sphere with a radius of 13ft is about 2,123.7ft2
13ft=3.96m 8ft=2.44m 3.96m by 2.44m = 9.66m2
2,123.7ft2
It will be a square shape and have an area of 169 square feet
What is 13ft x 8ft converted in sqm13ft x 8ft = 104ft2 which converts to 9.66m2
3.9624 metres
You'll need 3.53 cubic yards of cement.
6 ft 8 in
411.48 cm.