Page 93 - Mathematics Coursebook

8.3 Recognising rotational symmetry

3 Write down the order of rotational symmetry of each of these road signs.
a b c d e f

g h i j k I

4 Copy this table.

Number of lines of symmetry
0 1 2 3 4
Order of rotational 1
symmetry 2
3 a
4

Write the letter of each of the shapes below in the correct space in the table.
Shape a has been done for you.
a b c d

e f g h

5 Samir has five red tiles and four white tiles.

Draw two different ways that Samir could arrange these tiles so that he has
a shape with an order of rotational symmetry of 4.

6 Alex is making a pattern by colouring squares.
This is what he has drawn so far. He has coloured seven squares.

Make two copies of the diagram.
a In the first diagram, colour one more square so that the new pattern
has rotational symmetry of order 2.
b In the second diagram, colour five more squares so that the new pattern
has rotational symmetry f order 4.

92 8 Symmetry