Figure BCDE is made up of eight identical rectangles. Each rectangle has a length of 21 cm.
- Find the perimeter of Figure BCDE.
- Find the area of Figure BCDE
(a)
Breadth of one rectangle = 1 u
Length of one length = 3 u
3 u = 21
1 u = 21 ÷ 3 = 7
Length of Figure BCDE = 6 u
Breadth of Figure BCDE = 4 u
Perimeter of Figure BCDE
= 6 u + 6 u + 4 u + 4 u
= 20 u
= 20 x 7
= 140 cm
(b)
Area of 1 rectangle
= 21 x 7
= 147 cm
2 Area of Figure BCDE
= 8 x 147
= 1176 cm
2 Answer(s): (a) 140 cm; (b) 1176 cm
2