Study the figure.
- Find the perimeter of one small rectangle.
- Find the perimeter of the whole figure.
(a)
Length = 3 u
Breadth = 1 u
4 u = 20
1 u = 20 ÷ 4 = 5
3 breadth = 1 length of the small rectangle
= 3 x 5
= 15 cm
Perimeter of one small rectangle
= 15 + 5 + 15 + 5
= 40 cm
(b)
Length of the large rectangle
= 4 u
= 4 x 5
= 20 cm
Perimeter of whole figure
= 20 + 15 + 20 + 15
= 70 cm
Answer(s): (a) 40 cm; (b) 70 cm