Look at the pattern.
- What is the perimeter of Figure 6?
- What is the area of Figure 12?
- What is the perimeter of Figure 12?
(a)
Figure perimeter:
Figure 1 = 8 x 2 = 16 cm
Figure 2 = 8 x 3 = 24 cm
Figure 3 = 8 x 4 = 32 cm
Figure 4 = 8 x 5 = 40 cm
Formula:
Perimeter = 8 x (Figure Number + 1)
Perimeter of Figure 6
= 8 x (6 + 1)
= 8 x 7
= 56 cm
(b)
Figure Area:
Figure 1 = 1 x 16 = 16 cm
2 Figure 2 = 2 x 16 = 32 cm
2 Figure 3 = 3 x 16 = 48 cm
2 Figure 4 = 4 x 16 = 64 cm
2 Area of Figure 12
= 12 x 16
= 192 cm
2 (c)
Perimeter of Figure 12
= 8 x (12 + 1)
= 8 x 13
= 104 cm
Answer(s): (a) 56 cm; (b) 192 cm
2; (c) 104 cm