RD Sharma - Mathematics

Book: RD Sharma - Mathematics

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

Subject: Mathematics - Class 9th

Q. No. 5 of Exercise 20.1

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Find the total surface area of a right circular cone with radius 6 cm and height 8 cm.

We have,

Radius of right circular cone (r) = 6

Height of cone ( h) = 8 cm

slant height (l) = = l ==10 cm

Total surface area of cone = πr2+ πrl= πr(r+l)

= ×6×16 cm2=301.71 cm2

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