Answer:
\(7\ mm^{2}\)
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
\(A=bh\)
we have
\(b=3.5\ mm\)
\(h=2\ mm\)
substitute
\(A=3.5*2=7\ mm^{2}\)
