Each of the figures is made up of 1-cm ice-cream sticks.
The table shows the number of ice-cream sticks used to make the figures and their perimeters.

1. Find the number of ice-cream sticks in Figure 13.
2. What is the perimeter of Figure 191?
3. Which figure requires a total number of 2263 ice-cream sticks?

(a)
Pattern for the number of ice-cream sticks
Figure 1: 1 x 8 + 7 = 15
Figure 2: 2 x 8 + 7 = 23
Figure 3: 3 x 8 + 7 = 31

Formula:
Number of ice-cream sticks = Pattern number x 8 + 7

Number of ice-cream sticks in Figure 13
= 13 x 8 + 7
= 111

(b)
Pattern for the perimeter of the figure
Figure 1 = 1 x 2 + 7 = 9
Figure 2 = 2 x 2 + 7 = 11
Figure 3 = 3 x 2 + 7 = 13

Formula:
Perimeter of the figure = Pattern number x 2 + 7

Perimeter of figure 191
= 191 x 2 + 7
= 389

(c)
Figure number x 8 + 7 = 2263
Figure number x 8 = 2263 - 7 = 2256
Figure number = 2256 ÷ 8 = 282

Answer(s): (a) 111; (b) 389; (c) 282