Question

A ramp for unloading a moving truck has an angle of elevation of ${30}^{\circ }$. If the top of the ramp is $0.9m$ above the ground level, then find the length of the ramp.

Answer 1

From diagram
we have to find AC.
Since, ABC is right angled triangle.
$\Rightarrow \frac{BC}{AC}=\sin {30}^0$
$\Rightarrow \frac{0.9}{AC}=0.5$
$\Rightarrow AC=\frac{0.9}{0.5}$
$\Rightarrow AC=1.8$m