If it's a regular octahedron, then you can calculate it using the formula

where

is the length of the edge.
If it's not regular, you have to calculate the area of each side individually.
Answer: It would be A, B, and lastly E.
Answer:
Step-by-step explanation: The domain of the expression is all real numbers except where the expression is undefined
Answer:36in
Step-by-step explanation:9x4 is 36