Question

The surface area of a cone with radius r units and slant height s units is shown below:

Answer 1

Surface area of a cone = π{rs+r²}
                                     =πr{s+r}
part 1:if π is 6 units and s is 4 units then r would be 3.14 ×6 {4+6}

part 2: area of a cone = 3.14 ×6×10
                                  =31.4×6
                                    = 188.4 units²
the surface area = 188.4 
units²
 hope i helped 

Answer 2

S.A=π(rs+$r^{2} )$
Substituting for values of x;
S.A=3.14(6*4+$6^{2}$)
S.A=188.4 units