It is given in the question that,

Length of the rectangular sheet = 12 cm = cm

Also,

Breadth of rectangular sheet = 10 cm = cm

We know that,

Perimeter of rectangle = 2 × (Length + Breadth)

= 2 × ( + )

= 2 × []

= 2 × ()

= 2 ×

=

= 46 cm