waecmaths question:
The area of a rhombus is 110cm2. If the diagonal are 20cm and (2x +1)cm long. Find the value of x
Option A:
5.0
Option B:
4.0
Option C:
3.0
Option D:
2.5
waecmaths solution:
$\begin{align} & A=\frac{1}{2}{{d}_{1}}{{d}_{2}} \\ & 110c{{m}^{2}}=\frac{1}{2}\times 20\times (2x+1)c{{m}^{2}} \\ & 110=10(2x+1) \\ & 11=2x+1 \\ & x=5 \\\end{align}$
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