Question

If c= 13 and angle B = 25degrees, find a.

Answer 1

Given;

$\begin{gathered} \text{hypotenuse side c=13} \\ \text{Angle B= 25}^o \\ \text{adjacent side a=unknown} \\ \cos \theta=\frac{adjacent}{hypotenuse} \\ \cos 25=\frac{a}{13} \\ a=13\cos 25 \\ a=11.8 \end{gathered}$

The length of side a=11.8 to the nearest tenth.