Answer
$36$ square centimeters
Work Step by Step
RECALL:
The area $A$ of a rectangle can be found using the formula:
$A=lw$
where
l = length
w = width
The given rectangle has:
length = 9 centimeters
width = 4 centimeters
Use the formula and the given measurements above to obtain:
$A= lw
\\A=9(4)
\\A=36$
Thus, the area of the rectangle is $36$ square centimeters.