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