The find out Perimeter:

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

    (Substitute l = 9 and w = 4.5)

        (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 = 4.5)

  (Product of two same signs is positive)

cm       (Multiply: )

The perimeter (P) = 27 cm and area (A) = 40.5 cm.