$\"\"$

The length of a rectangle is $\"\"$ .

Height of a rectangle is $\"\"$ .

Area of the rectangle Area = Length $\"\"$ Breadth.

Area of the rectangle $\"\"$ .

Find the rate of change of the area with respect to time.

$\"\"$ .

Apply derivative on each side with respect to $\"\"$ .

$\"\"$

Product rule of derivatives : $\"\"$ .

$\"\"$

$\"\"$ cm²/sec.

$\"\"$

Rate of change of the area with respect to time is $\"\"$ cm²/sec.