Step 1: Check a rectangle (length not equal to width). Fold along the horizontal midline: halves match. Line 1. Fold along the vertical midline: halves match. Line 2. Fold along a diagonal: triangles are NOT congruent because length is not equal to width. Total: exactly 2 lines of symmetry. Step 2: A square has 4 lines (2 midlines + 2 diagonals). Not 2. Step 3: An isosceles triangle has 1 line of symmetry. Not 2. Step 4: A regular pentagon has 5 lines of symmetry. Not 2. Answer: A rectangle (length is not equal to width).