what length of tarpaulin 3 m wide ia required to make conical tent of height 8m and base radius 6m? Assume that extra length of material that wl be required for stitching the margins and wastage in cutting is approximately 20cm(use pie as 3.14)

here in the below ans wat ua the need for us to multiply it with 3?

and also how can they say that area is (l-0. 2)*3
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