Page 221 - ICSE Math 6

Step 3: Make a crease along the fold.

Step 4: The line along the fold is vertical and is called
the vertical line of symmetry.

Step 5: Try folding the rectangle in other ways, so that
the two parts of the rectangle coincide with
each other. Fold it along a horizontal line by
making the two lengths coincide.

Step 6: Press to form a crease.
Step 7: The line so formed is called the horizontal line of symmetry.

Step 8: We observe that a rectangle cannot be folded along any other line, so that the two
parts coincide. Thus, it has only two lines of symmetry.

3. Finding line(s) of symmetry of a square
Step 1: Draw a square on a white sheet of paper.

Cut it using a pair of scissors.

Step 2: Fold the square in such a way that its two parts coincide along
the line of fold.

Step 3: Make a crease along the fold.

Step 4: The line along the fold is called the line of symmetry.
Step 5: Repeat the above steps to verify that each dotted line in the adjacent figure is the
line of symmetry.

A regular polygon is symmetrical and it has as many lines of symmetry as its sides.

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