The rectangular piece of wood shown in Figure 1 has a perimeter of 30 cm. Kathy arranged 4 such rectangular pieces of wood to form a figure as shown in Figure 2.
- Find the length of the rectangular piece of wood.
- Find the shaded area in Figure 2.
(a)
Length of the rectangular piece of wood
=
30 - 3 - 32 =
242 = 12 cm
(b)
Length of the shaded area
= 12 - 3
= 9 cm
Shaded area in Figure 2
= 9 x 9
= 81 cm
2
Answer(s): (a) 12 cm; (b) 81 cm
2