Page 214 - ICSE Math 6

(m) A kite-shaped figure has only 1 line of symmetry as shown in
the adjoining figure.

Example 1: Draw all possible lines of symmetry of English alphabets given below.

(a) (b) (c) (d)

(e) (f) (g)

Solution: (a) (b) (c) (d)

(e) (f) (g) Z has no line of symmetry.

RefIection and Symmetry
If we see the image of any object in a mirror, then
the object and its mirror image are symmetrical
in reference to the mirror line.
On a paper mirror line can be treated as the line
of symmetry. The image is a reflection of the
object in the line of symmetry. When a figure is
reflected about a line, the image is congruent to Object Mirror Image
the original figure, i.e., the lengths and angles of line
the image are equal to the corresponding lengths
and angles of the original figure. However, in one aspect there is a change in the image and the object.
The image of the object is laterally inverted.

Try These

1. Collect objects like leaves, kite, stamps, coins, etc., and check them for reflection symmetry using a
mirror.
2. Draw the reflection of the letters D, F and Z using a mirror.

Example 2: Complete the figure to make it symmetrical
about line l.
l

Solution: l

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