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Question -

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



Answer -

Height of the conical tent (h) = 8 m
and radius of the base (r) = 6 m
Now curved surface area of the tent = ╧Аrl = 3.14 x 6 x 10 = 188.4 m
Width of tarpaulin used = 3 m
тИ┤ Length = 188.4 , 3 = 62.8 m
Extra length required = 20 cm = 0.2 m
тИ┤ Total length of tarpaulin = 62.8 + 0.2 = 63 m

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