Question

if the radius and length of cone are r/2 and 2l respectively what is total surface area.

Answer 1

Ans is
$176r + 44r {}^{2} \div 28$
............

Answer 2

total surface area of  cone = pi r( l + r)
                                           = 22/7 * r/2(2l +r/2)
                                          =11r/7(2l + r/2)
                                          =33r + 6r
                                           =39r