1. Revision
Description
Recall basics of
symmetry.
Reflect and Review
A rhombus is symmetrical
about its diagonals but not
sides, as shown below.
Teasers
Identity the
symmetrical shapes
among the following:
Answers
2)
1)
3)
2)
3)
4)
1
2. Symmetry
Description

An object is said to be
symmetrical if it matches
itself when we flip, slide
or turn it.

An image has line
symmetry or reflection
symmetry, if there is at
least one line which
divides the image in half,
so that one side is the
mirror image of the
other.

2
The line which divides the
shape into two identical
parts is called the line of
symmetry or axis of
symmetry.
Reflect and
Review
The mirror image of
the figure is as
shown below:
Teasers
1) Draw the mirror
image of the
following figure:
2) Is the figure shown
below symmetrical?
If yes, then draw the
line(s) of symmetry.
Answers
1)
2)
3. Symmetry in Geometrical Shapes
Description
Reflect and Review


Every geometrical
figure, whether regular
or irregular, can be
tested for line
symmetry.
All regular polygons,
and some types of
quadrilaterals and
triangles, are
symmetrical. In fact,
some of them have
more than one lines of
symmetry.

Isosceles triangle
Teasers
Draw the lines of
symmetry for the
following:
Answers
1)
1)
One line of symmetry.
2)

Trapezium
2)
Zero line of symmetry.

Circle
Infinite lines of
symmetry.
3
4. Symmetry in Letters
Description
Some English
alphabets have
horizontal line of
symmetry whereas
some have vertical
line of symmetry. A
few have both or
more than two.

Letters with only horizontal line
of symmetry:
Teasers
Draw the lines of
symmetry of the
following:
1)
Answers
1)
2)


4
Reflect and Review
Letters with only vertical line of
symmetry:
Letter with both lines of
symmetry:
2)