Q2 of 75 Page 221

Find the total surface area of a cone, if its slant height is 21 m and diameter of its base is 24 m

Radius (r) = = 12 m

Slant height (l) = 21 m


TSA of cone = πr(r + l)


= * 12 (12 + 21)


= * 12 * 33


= 1244.57 m2


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Diameter of the base of a cone is 10.5 cm and its slant height is 10 cm. Find its curved surface area

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(ii) Cost of the canvas required to make the tent, if the cost of 1 m2 canvas is Rs 70