Answer:
[tex]7\ mm^{2}[/tex]
Step-by-step explanation:
we know that
The area of the resulting two-dimensional cross-section is the area of a rectangle
The area of a rectangle is equal to
[tex]A=bh[/tex]
we have
[tex]b=3.5\ mm[/tex]
[tex]h=2\ mm[/tex]
substitute
[tex]A=3.5*2=7\ mm^{2}[/tex]