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# Find the Total Surface Area of a Right Circular Cone with Radius 6 Cm and Height 8 Cm. - CBSE Class 9 - Mathematics

ConceptSurface Area of a Right Circular Cone

#### Question

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

#### Solution

WKT, Total surface area = pirl+pir^2

Now l= sqrth(^2+r^2)            [by Pythagoras theorem]

Here, given

Radius=6cm and height =8cm

⇒ length=sqrt(6^2+8^2)

= 10cm

∴ Total surface area= pirl+pir^2

=(22/7xx6xx10)+ (22/7xx6xx6)

= (1320/7)+792/7 =301.71cm^2

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#### APPEARS IN

RD Sharma Solution for Mathematics for Class 9 by R D Sharma (2018-19 Session) (2018 to Current)
Chapter 20: Surface Areas and Volume of A Right Circular Cone
Ex.20.10 | Q: 5 | Page no. 7
Solution Find the Total Surface Area of a Right Circular Cone with Radius 6 Cm and Height 8 Cm. Concept: Surface Area of a Right Circular Cone.
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