Answer
$b=5952 \; m$.
$c=6273 \; m$.
Work Step by Step
The given values are
$a=1980\; m$
$A=18.4^{\circ}$
By using trigonometric ratios in the figure Illustration 1.
$\frac{a}{c}=\sin{A}$
Isolate $c$.
$c=\frac{a}{\sin{A}}$
Plug all values.
$c=\frac{1980\; m}{\sin{18.4^{\circ}}}$
Simplify (Use degree calculator).
$c=6273 \; m$ (rounded value).
By using trigonometric ratios in the figure Illustration 1.
$\frac{a}{b}=\tan{A}$
Isolate $b$.
$b=\frac{a}{\tan{A}}$
Plug all values.
$b=(1980\; m)\cdot \tan{(18.4^{\circ})}$
Simplify (Use degree calculator).
$b=5952 \; m$ (rounded value).
