RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 20. Surface Area and Volume of a Right Circular Cone

Subject: Mathematics - Class 9th

Q. No. 21 of Exercise 20.1

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21

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


we have,


Height of tent = 8 m


Base radius = 6 m


Slant height (l) == = 10 m


Curved surface area of the cone = πrl = 3.14×6×10 m2


Length of 3 m wide tarpaulin required


= = 62.8 m


Extra length required for stitching and cutting wastage = 0.2 m


Total length required = 62.8+0.2 = 63m


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