The depth of the box will be 3 inches, so the area of the bottom after folding will be

867/3 in^2 = 289 in^2

Each of the folded edges will be √289 in = 17 in.

The original sheet metal piece was 17 in + 6 in =

867/3 in^2 = 289 in^2

Each of the folded edges will be √289 in = 17 in.

The original sheet metal piece was 17 in + 6 in =

**23 in square.**