Study the patterns.
- Find the total number of triangles in Figure 18.
- Express the biggest triangle as a percentage of the total possible number of triangles in Figure 18. Correct your answer to 2 decimal places.
(a)
Pattern of the total number of triangles in the figure
Figure 1: 1 x 3 = 3
Figure 2: 2 x 3 = 6
Figure 3: 3 x 3 = 9
Formula:
Total number of triangles in the figure = Figure number x 3
Total number of triangles in Figure 18
= 18 x 3
= 54
(b)
Pattern of the biggest triangle as a percentage of the total number of triangles
Figure 1: 1 ÷ 3 x 100% = 33.3%
Figure 2: 1 ÷ 6 x 100% = 16.7%
Figure 3: 1 ÷ 9 x 100% = 11.1%
Formula:
Biggest triangle as a percentage of the total number of triangles = 1 ÷ total number of triangles in the figure x 100%
Biggest triangle as a percentage of the total number of triangles in Figure 18
= 1 ÷ 54 x 100%
= 1.85%
Answer(s): (a) 54; (b) 1.85%