Answer:60
Step-by-step explanation:
The cabinet got do deside I think sorry if I’m wrong
Dodecahedron is a 3D shape, usually when it ends with hedron it is 3D.
common ratio = a4/a3 = a3/a2
8/a3 = a3/18
(a3)^2 = 8 * 18
(a3)^2 = 144
a3 = 12 or a3 = -12
common ratio = 8/12 or common ratio = 8/(-12)
common ratio = 2/3 or common ratio = -2/3
Answer: 12 or -12
