Question 36

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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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