Q9 of 32 Page 250

The curved surface area of a cone is 4070cm2 and its diameter is 70 cm. What is its slant height?


Given that, curved surface area of a cone is 4070 cm2 and diameter(d) is 70 cm.


⇒ radius(r)


Let the slant height be l.


And, curved surface area of a cone = πrl


⇒ πrl = 4070




⇒ l = 37 cm


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