waecmaths question:
In the diagram, the shaded part is a carpet laid in a room with dimensions 3.5m by 2.2m leaving a margin of 0.5m round it. Find the area of the margin
Option A:
4.7m2
Option B:
4.9m2
Option C:
5.7m2
Option D:
5.9m2
waecmaths solution:
$\begin{align} & \text{Area of the room }=3.5\times 2.2{{m}^{2}}=7.7{{m}^{2}} \\ & \text{Area of the carpet}=(3.5-1)(2.2-1)=2.5\times 1.2{{m}^{2}}=3{{m}^{2}} \\ & \text{Area of the margin}=(7.7-3){{m}^{2}}=4.7{{m}^{2}} \\\end{align}$
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