A company that makes mirrors sends their slightly flawed products to a discount store. This week, the company sent four mirrors to the discount store. Each mirror is approximately rectangular, with both lengths the same and both widths the same.

Mirror 1
length: 16 inches
width: 18 inches
diagonal: 25 inches
Mirror 2
length: 16 inches
width: 18 inches
diagonal: 26 inches
Mirror 3
length: 16 inches
width: 18 inches
diagonal: 23 feet
Mirror 4
length: 16 inches
width: 18 inches
diagonal: 24 inches

Based on these dimensions, which mirror is the closest to rectangular?
Mirror 1
Mirror 2
Mirror 3
Mirror 4