Find the missing length (m) and perimeter for each figure.

  

Find the missing length (m) and perimeter for each figure.

Find the lengths (m) of the unknown side, then calculate the perimeter of each figure.

Find the lengths (m) of the unknown side, then calculate the perimeter of each figure.

A floor is $18$ m long and $12$ m wide. A square carpet with the side measuring $14$ m is laid on the floor.

What is the area of the floor that is not carpeted? Write answer in $m^2$.

The perimeter of a square lawn is $144 \mathrm{cm}$. Find the cost of mowing the lawn at the rate of $₹10$ per square metre. (Answer is $₹$_____)