Q9 of 63 Page 21

The curved surface area of a cone is 4070 cm2 and its diameter is 70 cm. What is its slant height? (Use π=22/7).

We have,


Area of curved surface = πrl = 4070 cm2


Radius of base r = 70/2 = 35 cm


= ×35×l =4070 = l = 37 cm


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