Answer:
The vertex of the function is
Step-by-step explanation:
I've graphed this on desmos for a visual
(x +12) (x -12) =0
x = 12
x = -12
r = 6 in
=
r²h/3 = 216
r² (18/3) = 6 r² = 216
r² = 216/6 = 36
r = 6
That’s a big question