Answer:
The correct option is C.
Step-by-step explanation:
From the given figure it is clear that the radius of the cone is 3 units and slant height of the cone is 12 units.
The surface area of the right cone is
[tex]Area=\pi rl+\pi r^2[/tex]
Where, r is radius, l is slant height.
Substitute r=3 and l=12 in the above formula.
[tex]Area=\pi (3)(12)+\pi (3)^2[/tex]
[tex]Area=36\pi+9\pi[/tex]
[tex]Area=(36+9)\pi[/tex]
[tex]Area=45\pi[/tex]
The surface area of the given right cone is 45π units².
Therefore the correct option is C.
