Answer
$B = 65˚$
$c \approx 20$ cm
Work Step by Step
1. Solve for the angle $B$
$B + 33 + 82 = 180$
$B + 115 = 180$
$B = 65˚$
2. Solve for $c$
$\frac{c}{sin(82)} = \frac{18}{sin(65)}$
$c = \frac{18sin(82)}{sin(65)}$
$c = \frac{17.82...}{0.906...}$
by GDC / calculator
$c = 19.6675...$ cm
$c \approx 20$ cm
