RD Sharma - Mathematics

Book: RD Sharma - Mathematics

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

Subject: Mathematics - Class 9th

Q. No. 9 of Exercise 20.1

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9

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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