$\"\"$

The find out Perimeter:

Perimeter of the rectangle is $\"\"$ where l is the length and w is the width.

$\"\"$ (Substitute l = 9 and w = 18)

$\"\"$ (Add: $\"\"$ )

$\"\"$ cm (Multiply: $\"\"$ ) $\"\"$

The find out Area:

Area of the rectangle is $\"\"$ where l is the length and w is the width.

$\"\"$ (Substitute l = 9 and w = 18)

$\"\"$ (Product of two same signs is positive)

$\"\"$ (Multiply: $\"\"$ ) $\"\"$

The perimeter (P) = 54 cm and area $\"\"$ .