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