If length of a rectangle is halved and breadth is doubled then the area of the rectangle obtained remains same.
Area of a square is doubled if the side of the square is doubled.
Perimeter of a regular octagon of side 6 cm is 36 cm.
A farmer who wants to fence his field, must find the perimeter of the field.
An engineer who plans to build a compound wall on all sides of a house must find the area of the compound.
To find the cost of painting a wall we need to find the perimeter of the wall.
To find the cost of a frame of a picture, we need to find the perimeter of the picture.