Does the letter A have reflection symmetry, and how many lines of symmetry do a square and a rectangle have? Step 1: The test is a fold. Imagine a vertical line down the middle of the letter A and fold along it. The left half lands exactly on the right half - every edge matches, nothing sticks out. So A HAS reflection symmetry, and that fold line is a line of symmetry. Step 2: Run the same test on a square, four ways: vertical fold - match. Horizontal fold - match. Diagonal fold corner to corner - match. Other diagonal - match. A square has 4 lines of symmetry. Step 3: Run it on a rectangle (longer than it is wide). Vertical and horizontal folds match. But fold corner to corner along a diagonal and the edges stick out past each other - the halves do NOT match. A rectangle has only 2 lines of symmetry. Say it plainly: never guess from the shape's name or from having "pairs of equal sides." Run the fold test, one candidate line at a time.

Does the letter H have a HORIZONTAL line of symmetry? -> Yes - folding top to bottom makes the halves match, so H has both a vertical and a horizontal line (2 in total).