When the space occupied by an object is a two-dimensional space, the size of the space occupied is called the area of the object, which can be plane or curved. Square meters, square decimeters and square centimeters are recognized units of area and can be expressed as (m? ，dm？ ，cm？ )。
Area is a quantity indicating the degree of a two-dimensional figure or shape or plane layer in a plane. A surface region is a simulation on a two-dimensional surface of a three-dimensional object. Area can be understood as the amount of material with a given thickness, which is necessary to form a shape model. Or the amount of coating required to cover the surface with a single coating.
It is a two-dimensional simulation of curve length (one-dimensional concept) or solid volume (three-dimensional concept). The area of a shape can be measured by comparing a fixed size shape with a square. In the International System of Units (SI), the standard unit area is square meters. A square area with an area of one meter and an area of three square meters will have the same shape as three such squares.
In mathematics, the unit square is defined as 1, and the area of any other shape or surface is a dimensionless real number. There are several well-known formulas for simple shapes, such as triangle, rectangle and circle. Using these formulas, you can find the area of any polygon by dividing it into triangles. For shapes with curved boundaries, calculus is usually needed to calculate the area.
Area bisector:
There are countless lines bisecting the triangle area. Three of them are the midpoints of the triangle, which coincide at the center of gravity of the triangle; In fact, they are the only area bisectors passing through the center of gravity. Any line that divides the area and perimeter of a triangle into two halves can pass through the entrance of the triangle (the center of its perimeter). ?
For any given triangle, there are one, two or three triangles. Any line passing through the midpoint of the parallelogram divides the area in two. All bisectors of the area of a circle or other ellipse pass through the center, and any chord passing through the center bisects the area. For circles, they are the diameter of the circle.