How_To_Be_Good_At_Math

Making pie charts

Now we align the protractor

with the lower edge of the

lemon sector and measure a 90°

angle for the mango sector. We

complete and colour in this sector.

Then we draw a line from

the 162° angle back to the

centre. The lemon sector is now

complete. Let’s colour it in.

We’ll draw a circle using a pair

of compasses, so that it’s

accurate. We must make our circle

big enough so that it’s easy to

colour in and put labels on.

Let’s draw a line from the

centre to the circle’s edge.

We’ll mark this as 0° and use it

to measure our first angle.

Next, we put our protractor

on our 0° line and use its

scale to measure an angle of

162° for the lemon sector.

Drawing the chart

Once we’ve found all the

angles for the pie sectors,

we’re ready to make our chart.

We’ll need a protractor and a

pair of compasses.

Centre

Draw the outline

(circumference) of the circle

We draw the remaining sectors

in the same way. To finish off our

chart, we add labels and a heading.

162°

162°

Draw a line to

the circle’s edge

Draw a line

back to

the centre

Mark the angle, then draw

a line back to the centre

0°

0°

0°

LEMON

MANGO

STRAWBERRY

MINT

Flavours of ice cream sold

Measure the

second angle

from here

Our completed

lemon sector

90°

Mark

the angle

294_295_Making_pie_charts.indd 295 29/02/2016 18:07