Question 21

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waecmaths question: 

Kweku walked 8m up a slope and was 3m above the ground. If he walks 12m further up the slope, how far above the ground will he be?

Option A: 

4.5m

Option B: 

6.0m

Option C: 

7.5m

Option D: 

9.0m

waecmaths solution: 

$\begin{align}  & \sin \theta =\frac{BE}{AB}=\frac{3}{8} \\ & \sin \theta =\frac{CD}{AC}=\frac{CD}{20} \\ & \therefore \frac{3}{8}=\frac{CD}{20} \\ & CD=\frac{3}{8}\times 20=7.5m \\\end{align}$

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