The coverage area of a math textbook is about 500 square centimeters or 5 square decimeters. 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.

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.

Region:

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 paint required to cover a surface with a single coating.

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.

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 formula

Area formulas include rectangular area formula, square area formula, sector area formula, circular area formula, bow area formula, diamond area formula, triangle area formula, trapezoid area formula and other graphic area formulas.

Bottom area calculation

Known bottom radius: bottom area = radius × radius × pi; Known base diameter: diameter ÷ 2 = radius, base area = radius × radius× π; The volume and height of a cylinder are known: bottom area = volume ÷ height.

Calculation of area

Lateral area of cylinder = bottom circumference × height: S side =Ch(C stands for bottom circumference and H stands for cylinder height); The bottom area of a cylinder = π r? ; Cylinder surface area = lateral area+two bottom areas (S table =S side +2S bottom), S table =2πr? +2πrh, S side =2πrh, S bottom =πr? .