Answer
15 $units^{2}$
Work Step by Step
Count the units between A and B as well as the units from the base, AB, to point F:
A=bh
A=(5)(3)
A=15
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.