Since the Circumference of the base which is 24pi is also the length of the lateral are then to solve for the Area of the lateral edge simply use A=lw=bh=(24pi)(5)=377
so the surface area is area of the base x 2 + area of lateral surface=2piR^2+2piRh
C=2piR A=piR^2 Surface Area=2(452.39)+377
24pi=2piR A=pi(12^2) =1281.78
R=24pi/2pi A=452.39
R=12