Given the figure of a cone:
As shown:
The radius of the cone = r = 5 ft
The slant height = l = 12.1 ft
The surface area of the cone = SA
[tex]SA=\pi(r^2+rl)[/tex]Assume pi = 3.14, and substitute with r and l
[tex]SA=3.14\cdot(5^2+5\cdot12.1)=3.14\cdot85.5=268.47[/tex]Rounding to the nearest tenth
So, the answer will be surface area = 268.5 ft^2
