Question

Find the total surface area of a cone whose radius R/2 Slant height=12. ​

Answer 1

Answer:

Simplifying the above expression, the total surface area of the cone is =πr2(r2+2l)=πr(r4+2l2)=πr(r4+l). Hence, the total surface area of the cone whose radius is r2 and slant height is 2l is πr(r4+l), which is option (b).

Answer 2

Answer:

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Simplifying the above expression, the total surface area of the cone is =πr2(r2+2l)=πr(r4+2l2)=πr(r4+l). Hence, the total surface area of the cone whose radius is r2 and slant height is 2l is πr(r4+l), which is option (b).