Exercises: Sine, Cosine and Tangent on a right triangle

Given: $\begin{array}{l}a=5\text{ cm}\\ \alpha =75°\end{array}$

Required: $b$

The opposite cathetus of $\alpha$ is given and the adjacent cathetus of $\alpha$ is sought. Therefore we use the tangent of $\alpha$.

Side $b$ has a length of approx. $1.34\text{cm}$.