Answer
$1.73 \ square \ units$
Work Step by Step
We apply the area formula:
$k=\dfrac{1}{2} b \ c \sin A$
Plug in the given data.
Therefore, $k=\dfrac{1}{2} (4)(1) \sin (120^{\circ}) \approx 1.73 \ square \ units$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.