Page 237 - Math Smart - 7

In this chapter

Pupils should be able to:
• recognise line and
rotational symmetry in
2D shapes and patterns
• identify the order of
rotational symmetry
Line of symmetry
• draw lines of symmetry
and complete patterns
with two lines of
i Investigate! symmetry
m

o Take a square piece of paper and fold it in half.

e Use a pair of scissors to cut out the shape as shown.
What shape will the hole in the middle be?

0 Draw a dotted line along the fold line. Is this line the Talk about the properties
line of symmetry? Does the shape have any other lines of symmetry? of each shape.
Discuss the shapes when
o Can you find the fold lines or lines of symmetry for the following
the paper was folded
shapes in order to cut them out?
in half and when it was
unfolded.
X Challenge yourself to
make other shapes by
folding a square piece of
paper in half and cutting
out the shapes.
What shapes do you think
are impossible to make?
^ RECALL

O Circle the shapes that have reflective symmetry.

* M i

Q Circle the shapes that do not have rotational symmetry.

4

A figure with at least one line of symmetry diagonal line
of symmetry
is a symmetric figure. When a figure is
folded along a line of symmetry, the two
horizontal line
parts of the figure fit exactly. A line of
of symmetry
symmetry is also called an axis of symmetry.
A shape can have more than one axis of
symmetry. The plural for axis is axes. diagonal line
of symmetry
vertical line of symmetry