Answer:
SA = 189pi
Step-by-step explanation:
Surface Area of a Cone is given as:
[tex]SA = \pi r\l + \pi r^2[/tex]
Where:
[tex]\pi r\l =[/tex] area of lateral surface
[tex]\pi r^2 =[/tex] area of circular base
We are given:
l = 12 cm
r = 9 cm
So, substitute values in and solve.
[tex]SA = (\pi \times 9 \times 12) + (\pi \times9^2) \\SA = 108\pi + 81\pi \\SA = 189\pi[/tex]
