Page 135 - ICSE Math 5
P. 135
Solution: (a) (b)
(c) (d)
Types of Symmetry
Symmetry in two-dimensional shapes or figures can be seen when they are flipped across a line
or turned around a point. The two basic types of symmetry observed in two-dimensional shapes
or figures are reflection symmetry and rotational symmetry. Let’s learn about these two types of
symmetry.
Refl ection symmetry
Reflection is the mirror image of an object when it is flipped
across a line. Reflection symmetry is a type of symmetry in which
one half of the object is the mirror image or the reflection of the
other half. It is also known as mirror symmetry.
Look at the reflection of letter B given alongside. Here the
reflection of letter B is an inverted or flipped image of the original Object Mirror Image
letter.
When a figure is reflected across a line, its right becomes left of the reflected image and
vice versa.
Some examples of reflection symmetry in English alphabet are shown below.
Top Tip
Every reflection has a
mirror line.
125
