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CBSE Class 10 Answered

The interior of a building is in the form of a cylinder of base radius 12 m and height 3.5 m surmounted by a cone of equal base and slant height 13 m. Find the internal curved surface area of the building.
Asked by Topperlearning User | 25 Oct, 2017, 01:50: PM
answered-by-expert Expert Answer
begin mathsize 12px style Curved space surface space area space of space the space interior space of space the space building space equals space Curved space surface space area space of space the space cylindrical space portion space plus space Curved space surface space area space of space the space conical space part equals 2 πrh space plus space πrl equals space πr open parentheses 2 straight h space plus space straight l close parentheses equals space 22 over 7 cross times 12 open parentheses 2 cross times 3.5 space plus space 13 close parentheses space straight m squared equals space 22 over 7 cross times 12 cross times 20 equals space 5280 over 7 equals space 754.28 space straight m squared Hence comma space Curved space surface space area space of space the space interior space of space the space building space equals space space 754.28 space straight m squared end style
Answered by | 25 Oct, 2017, 03:50: PM

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