Area of a rectangle or square

You have found area by counting the square units a figure covers. Today, we will find the area of a rectangle or a square by multiplying. Lin draws a rectangular tile design, 7 centimetres long and 4 centimetres broad. Find its area. Each small square has sides of 1 centimetre. That small square has an area of 1 square centimetre. We write 1 square centimetre like this. The length is 7 centimetres, so each row has 7 squares. The breadth is 4 centimetres, so there are 4 rows. 4 rows of 7 squares is 7 times 4 squares. So the area of a rectangle is length times breadth. 7 times 4 is 28 square centimetres. Multiplying is quicker than counting every square.

Lin draws a square tile with sides of 5 centimetres. Find its area. Try it first. Pause if you like. All the sides of a square are the same length. So the area of a square is side times side. 5 times 5 is 25 square centimetres.

A rectangular terrace floor is 9 metres long and 3 metres broad. Find its area. Try it first. Pause if you like. The sides are in metres, so the area is in square metres. Area of a rectangle is length times breadth. 9 times 3 is 27 square metres. Area of a rectangle is length times breadth. Area of a square is side times side.