Thus, the formula for the area of a rectangle is : Area of the rectangle = length × width. The area of a rectangle is obtained by multiplying its length and width which is the same as counting the unit squares. In the above example, the length of the rectangle is 3 units and the width is 2 units.

Consider the yellow rectangle in the grid. The area of a rectangle is the space occupied by it. Note that this is only an approximate value. For regular shapes, we have certain formulas to calculate their area. If the shaded region is less than 1/2, we can omit those parts. Together this forms an area of 8 square units. Here, the area occupied by the shape = 4 full squares and 8 half squares.

If it occupies about 1/2 of the unit square, we can combine two such halves to form an area of 1 square unit. When the shape does not occupy a complete unit square, we can approximate and find its value. Thus, the area of the shape = 9 square units. The area of this shape is the number of shaded unit squares. Let us find the area of the shape drawn in the grid. Hence, each square is known as a unit square. The area of each of these squares is 1 square unit. The grid is made up of many squares of sides 1 unit by 1 unit. The area of any shape is the number of unit squares that can fit into it. Let us see how to calculate the area of a shape with the help of a grid.

What is area 21