A square is a special type of rectangle characterized by having all four sides equal in length, parallel sides, right angles, and equal diagonals. The area of a square is calculated as follows:

The area of the square is the square of the length of the side, so S=a*a

Here are some practical examples of square areas:

1. If the side length of a square room is 5 metres, then its area is 5*5=25 square metres.

2. A square lawn has a side length of 8 metres, so its area is 8*8=64 square metres.

3. If the sides of a square book are 20 centimetres long, its area is 20*20=400 square centimetres.

4. The sides of a square tile are 30 centimetres, so its area is 30*30=900 square centimetres.

5. A square swimming pool has a side length of 12 metres, so its area is 12*12=144 square metres.

Through these practical examples, we can better understand and grasp the concept and application of square area, and also think about how to use the square area formula to solve more complex and practical problems.