waecmaths question:
If the perimeter of ΔPQR in the diagram is 24cm, what is the area of ΔPRS?
Option A:
19.5cm2
Option B:
15.0cm2
Option C:
13.0cm2
Option D:
9.3cm2
waecmaths solution:
$\begin{align} & \vartriangle PQR \\ & 6cm+8cm+\left| PR \right|=24cm \\ & \left| PR \right|=10cm \\ & Area\text{ of }\vartriangle PRS=\frac{1}{2}\times b\times h=\frac{1}{2}\times 10\times 3c{{m}^{2}}=15c{{m}^{2}} \\\end{align}$
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