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OpenStudy (sbuck98):
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OpenStudy (sbuck98):
@jhonyy9
OpenStudy (marcoreus11):
first u need to know the formula for the area of a triangle
OpenStudy (anonymous):
Calculate the area of the circumscribed rectangle and then subtract off the outer triangles.\[7\ 4-\frac{1}{2} (2\ 4+3\ 5+1\ 7)=13 \]
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