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.
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 model of shape, or the amount of paint required to cover a surface with a single coating. It is a two-dimensional simulation of curve length (one-dimensional concept) or solid volume (three-dimensional concept).
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. In fact, the problem of determining the digital area of aircraft is the main driving force for the historical development of calculus.
Area bisector
There are countless lines bisecting the triangle area. Three of them are the median of the triangle (connecting the midpoint of both sides and the opposite vertex), and they are collinear 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.