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CBSE Class 9 Answered

The toy is in the form of a cylinder surmounted by a cone. The cylinder is of diameter 30 cm and height 23 cm and the cone has slant height 17 cm. Calculate the surface area of the toy.
Asked by Topperlearning User | 24 Oct, 2017, 03:20: PM
answered-by-expert Expert Answer

Radius of the conical part = Radius of the cylindrical part (r) = 15 cm

Height of cylindrical part (h) = 23 cm, slant height of the cone (l ) = 17 cm

Surface area of the toy = Curved surface area of the conical part + curved surface area of the cylindrical part

begin mathsize 12px style equals πrl space plus space 2 πrh equals πr space left parenthesis l plus 2 straight h right parenthesis equals 22 over 7 cross times 15 open parentheses 17 plus 2 cross times 23 close parentheses equals 22 over 7 cross times 15 cross times 63 equals 2970 space cm squared end style

 

Surface area of the toy is 2970 cm2

 

Answered by | 24 Oct, 2017, 05:20: PM

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