Step 1: A vertical line of symmetry divides a figure into left and right halves that are mirror images Step 2: Check each letter: - P: bump on the right side only, not symmetric - M: has two bumps on top, but the shape is symmetric vertically - A: has a peak at top, symmetric left and right - Z: diagonal lines, not symmetric Wait, let me reconsider. A is symmetric because folding vertically creates matching halves. Answer: A has a vertical line of symmetry.