RD Sharma - Mathematics

Book: RD Sharma - Mathematics

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

Subject: Mathematics - Class 9th

Q. No. 2 of Exercise 20.1

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2

The radius of a cone is 5 cm and vertical height is 12 cm. Find the area of the curved surface.

Radius of cone (r) = 5 cm


Vertical height (h) = 12 cm


Slant height of cone (l) = (r2+h2) = (52+122) = √25+144 = √169 = 13 cm


Curved surface area of cone = πrl = 22/7×5×13 = 204.28 cm2


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