1. First, you need to know the standard size of A4 paper, and then use the area formula to calculate it. The standard size of A4 paper is 2 1cm×29.7cm, and the area formula is: area = length× width. So the area of A4 paper is: 21cm× 29.7cm. Now we will use this formula to calculate the area of A4 paper.

2. The calculation result shows that the area of A4 paper is 623.7 square centimeters. Therefore, the area of a piece of A4 paper is about 623.7 square centimeters, which is very close to the given 6.

The concept of area

1, area is a very important geometric concept, which helps us to know and understand the sizes of various shapes and areas in a plane or space. By mastering the calculation methods and application scenarios of area, we can better solve various problems and make more accurate decisions in our daily life and work.

2. Area is a widely used term in geometry, indicating the size of area in two-dimensional plane or three-dimensional space. In mathematics and daily life, we often need to calculate or describe the areas of various shapes.

Let's consider the shape on the plane. The plane area can be calculated by dividing each part of the shape into small units where the area can be calculated. These cells can be square, rectangle, triangle or any other regular or irregular shape. Then, we can calculate the number of these units and multiply it by the area of each unit to get the area of the whole shape.

4. For the shapes of three-dimensional space, such as spheres or cubes, we can divide them into several small, computable two-dimensional surfaces or three-dimensional spaces. Then, we can calculate the number of these parts and multiply them by the area or volume of each part to get the area or volume of the whole shape.

The concept of area is not only widely used in mathematics, but also common in daily life. For example, we may need to calculate the area of a house to know its size, or calculate the area of farmland to estimate its output. In addition, the concept of area often appears in the fields of commerce, engineering, science and art.