Species No of
types% Slice angleInsects 17
17 × 100
50= 34 %
34 × 360
100
=122,4◦
Plants 16
16 × 100
50= 32 %
16 × 360
100
=115,2◦
Birds 9
9 × 100
50= 18 %
18 × 360
100
= 65 ◦
Amphibians 8
8 × 100
50= 16 %
16 × 360
100
=57,6◦
Table 1.1: Table showing recordings and calculations for construction of a pie chart- Use a compass to draw the circle and a protractor to measure accurate angles for each
slice. - Start with the largest angle/percentage starting at 12 o’ clock and measure in a clock-
wise direction. - Shade each slice and write the percentage on the slice and provide a key.
Figure 1.6: Pie chart showing the relative proportions of different categories of organisms in an
ecosystemActivity: Converting tables to graphsReason:18 1.7. How to draw graphs in Science