Question

the radius and slant height of a cone is r/2 and 2l respectively.find the total surface area of cone.

Answer 1

$\pi \alpha \beta ln(e \cos( \alpha \binom{ \beta \pi \beta \cot( \sin(e \cos( \binom{ \infty \csc( \alpha e \cos(\%) ) }{?} ) ) ) }{?} ) )$