Lines of symmetry in letters

In your book, Maths Mela (Chapter 10), Prem and Manu are making 'Happy Birthday' cutouts to paste on a wall for Lali's birthday. They remember lines of symmetry from Grade 4. A line of symmetry cuts a shape into two halves that match exactly when you fold along it.

The capital letter A has a vertical line of symmetry: a line going straight down through its middle. So to cut out an A, they fold a paper in half, draw half of the A along the fold, cut along the outline, and open the paper. The full A appears, because the other half is a perfect copy.

The capital letter H has two lines of symmetry: a vertical one down its middle and a horizontal one across its middle. So they can fold the paper into one-fourth, once vertically and once horizontally, and draw just one-fourth of the H along the folds. When they cut and open it, the whole H appears.

Other letters work the same way. The capital letters T and V have only a vertical line, so half is enough. The capital letter E has only a horizontal line, across its middle arm, so half is enough if you fold the paper across. The capital letters X and O have both lines, so a quarter is enough. But the capital letter N has no line of symmetry at all: however you fold it, the two halves do not match, so N cannot be cut out this easy way.