Mensuration

9

Contents:

A Length [6.1]

B Perimeter [6.2]

C Area [6.1, 6.2, 6.5]

D Circles and sectors [6.3, 6.5]

Opening problem

#endboxedheading

A javelin throwing arena is illustrated

alongside. It has the shape of a sector of

a circle of radius 100 m. The throwing

line is 5 m from the centre. A white line

is painted on the two 95 m straights and

on the two circular arcs.

a Find the total length of the painted

white line.

b If the shaded landing area is grassed,

what is the total area of grass?

The measurement oflength,area,volumeandcapacityis of great importance.

Constructing a tall building or a long bridge across a river, joining the circuits of a microchip, and

rendezvousing in space to repair a satellite all require the use of measurement with skill and precision.

Builders, architects, engineers and manufacturers need to measure the sizes of objects to considerable

accuracy.

The most common system of measurement is theSystème International (SI).

(length and area)

centre

5m

40°

95 m

throwing

line

IGCSE01

cyan magenta yellow black

(^05255075950525507595)
100 100
(^05255075950525507595)
100 100
Y:\HAESE\IGCSE01\IG01_09\191IGCSE01_09.CDR Tuesday, 18 November 2008 11:00:14 AM PETER