Page 90 - Mathematics Coursebook

8.2 Recognising line symmetry

8.2 Recognising line symmetry

!is trapezium is symmetrical.

It has one line of symmetry.

You use dashed lines to show lines of symmetry on a shapes.

If you fold a shape along a line of symmetry, one half of the shape

will "t exactly on top of the other half.

Worked example 8.2

How many lines of symmetry does each of these shapes have?
a b

a 2 This shape has a vertical line of symmetry and a horizontal
line of symmetry.
b 0 This shape has no lines of symmetry.

) Exercise 8.2

1 Each of these shapes has one line of symmetry.
Copy the shapes and draw the lines of symmetry on your diagrams.
a b c d

2 Each of these shapes has two lines of symmetry.
Copy the shapes and draw the lines of symmetry on your diagrams.

a b c d

3 Write down the number of lines of symmetry for each of these shapes.
a b c d

4 Copy and complete the table for these triangles. The first one is done for you.

a b c Type of triangle Number
Right- of lines of
Isosceles Equilateral Scalene
angled symmetry
a 1
d e b
c
d
e

8 Symmetry 89