Page 53 - Cambridge+Checkpoint+Mathematics+Coursebook+9
P. 53
5.6 Symmetry in three-dimensional shapes
5.6 Symmetry in three-dimensional shapes
!ree-dimensional shapes can be symmetrical.
!is chair is symmetrical.
!e second picture shows a plane of symmetry.
Imagine a mirror on the plane.
One half of the chair is a re'ection of the other.
Worked example 5.6
Look at this table.
a How many planes of symmetry does it have?
b Show them on a diagram.
a Two
b
) Exercise 5.6
1 Each of these shapes has one plane of symmetry. Show them on drawings.
a b c
2 a has two planes of symmetry and b has three. Show them on diagrams.
a b
2 cm
4 cm 3 cm
52 5 Shapes
