Cambridge International Mathematics

6 Assumed Knowledge (Geometry and graphs)

1 Classify these triangles:

abc

de f

2 Draw diagrams to illustrate:

a a quadrilateral b a pentagon c a hexagon

d an octagon e a regular quadrilateral f a regular triangle

g a parallelogram h a rhombus i a trapezium

3 List with illustration:

a thethreeproperties of a parallelogram b thefourproperties of a rhombus.

LINE SYMMETRY

A figure hasline symmetryif it can be reflected in a line so that each

half of the figure is reflected onto the other half of the figure.

A square has 4 lines of symmetry.

Example 1 Self Tutor

For the following figures, draw all lines of symmetry:

abc

D SYMMETRY [4.2]

A figure has a line

of symmetry if it can

be folded onto itself

along that line.

For example, an isosceles triangle has

one line of symmetry, which is the line

from its apex to the midpoint of its base.

EXERCISE C

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