Cambridge International Mathematics

196 Mensuration (length and area) (Chapter 9)

7 Find the perimeter of the house in the plan

alongside.

8

9 Calculate the length of wire required to construct the frame

for the model house illustrated alongside.

All around us we see surfaces such as walls, ceilings, paths and ovals. All of these surfaces have boundaries

that help to define the surface.

Anareais the amount ofsurfacewithin specified boundaries.

Theareaof the surface of a closed figure is measured in terms of the number

of square units it encloses.

UNITS OF AREA

Area can be measured in square millimetres, square centimetres, square metres and square kilometres; there

is also another unit called a hectare (ha).

Since 1 m= 100cm, these squares have the same area.

So, 1 m^2 = 100cm £ 100 cm

= 10 000cm^2

1 mm^2 =1mm£ 1 mm

1 cm^2 =10mm£ 10 mm = 100mm^2

1 m^2 = 100cm£ 100 cm = 10 000cm^2

1 ha= 100m£ 100 m = 10 000m^2

1 km^2 = 1000m£ 1000 m = 1 000 000m^2 or 100 ha

C AREA [6.1, 6.2, 6.5]

3.7 m 4.1 m

1m

3.6 m 2.8 m

3.1 m 2.9 m

An octagonal area of lawn is created by removing

m by m corners from a rectangular area. Find

the new perimeter of the lawn.

22

8m

5m

2m

6cm

9cm

4cm

1m

1m

100 cm

100 cm

IGCSE01

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100 100
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100 100
Y:\HAESE\IGCSE01\IG01_09\196IGCSE01_09.CDR Thursday, 2 October 2008 11:44:37 AM PETER