The volume of regular octahedron PABCDQ is 243. What is the side length of the octahedron?
V = √2 * (side)^3 / 3
243 = √2 (side)^3 / 3 multiply both sides by 3 / √2
243 * 3 / √2 = side^3 take the cube root of both sides
side ≈ 8.018
