Oscar has a large library of books. he has nine biographies, twenty-four fictions, eight reference books, and ten non-fictions.
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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.
If it's not regular, you have to calculate the area of each side individually.