What length of tarpaulin 3 m wide will be required to make conical tent of height 8 m and base radius 6m?

What length of tarpaulin 3 m wide will be required to make conical tent of height 8 m and base radius 6m? Assume that the extra length of material that will be required for stitching margins and wastage in cutting is approximately 20 cm. (Use π = 3.14)