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प्रश्न
The area of the curved surface of a cone of radius 2r and slant height `1/2`, is
विकल्प
`pirl`
`2pirl`
`1/2pirl`
`pi (r+l)r`
उत्तर
The formula of the curved surface area of a cone with base radius ‘r’ and slant height ‘l’ is given as
Curved Surface Area = πrl
Here the base radius is given as ‘2r’ and the slant height is given as ‘`l/2`’
Substituting these values in the above equation we have
Curved Surface Area = `((pi)(2)(r)(l))/2`
= πrl
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