What length of tarpaulin 3m wide will be required to make a conical tent of height 8m and base redius6m? Extra length of material used for margins is 20cm (take 3.14)
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https://www.meritnation.com/ask-answer/question/wide-will-be-required-to-make-conical-tent-of-height-8/surface-areas-and-volumes/6295630