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2015-04-01T16:03:25+05:30

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Given radius= 9 cm
         height =12 cm
slant height=√r²+h²
                 =√9²+12²
                 =√81+144
                 =√225
                 ⇒15 cm 
slant height =15cm
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2015-04-01T16:03:57+05:30

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By pythagoras theorem,
l^2=r^2+h^2
here,l^2=12^2+9^2=225
so l,i.e.slant height equals=root of 225=15cm
          
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