Answer
$b \approx3.08$, $a \approx8.46$, $A =70^\circ$.
Work Step by Step
Given $c=9, B=20^\circ$, we have $b=c\ sinB=9sin20^\circ\approx3.08$, $a=c\ cosB=9cos20^\circ\approx8.46$, $A=90^\circ-B=70^\circ$.
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