Answer
$b \approx 71$ inches
Work Step by Step
$\frac{b}{sin(120)} = \frac{28}{sin(20)}$
$b = \frac{28sin(120)}{sin(20)}$
$b = \frac{24.248...}{0.3420...}$
by GDC / calculator
$b = 70.898...$ inches
$b \approx 71$ inches
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