Answer
$1 \ sq. units$
Work Step by Step
We are given that $f(x)=\int_0^1 \ dx$
Here. the area of a rectangle is equal to $A= \int_0^1 \ dx$
$=(Base) \times Height$
$=(1)(1)$
Thus, $\int_0^1 \ dx=1 \ sq. units$
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