Answer
$1.48 \ square \ units$
Work Step by Step
We apply the area formula:
$k=\dfrac{1}{2} b \ c \sin A$
Plug in the given data.
Therefore, $k=\dfrac{1}{2} (1)(3) \sin (80^{\circ}) =1.5 \sin (80^{\circ}) \approx 1.48 \ square \ units$
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