Area of rectangle = length × width. Area of a square = side length × side length. Area of triangle = base × height ÷2. Area of parallelogram = base × height. Trapezoidal area = (upper bottom and lower bottom) × height ÷2. Area of circle = π× radius 2. Lateral area of a cylinder: the lateral area of a cylinder is equal to the perimeter of the bottom multiplied by the height. Surface area of cylinder: surface area of cylinder = bottom area+side area.

Extended data:

Generally speaking, geometry is a mathematical formula of the volume of a graph composed of faces, intersection lines (intersection points of faces) and intersection points (intersection points of intersection lines or convergence points of surfaces). Cuboid volume formula: volume = length × width × height. The volume formula of a cube is v = a.a.a = a? .

The volume of the cone = the area of the bottom × the height × one third. Triangular pyramid is the most common and basic figure in three-dimensional space, just like triangle in two-dimensional space.

When calculating the volume of space assembly, we should first consider that space assembly is composed of those basic geometric shapes-cylinder, cone, table and ball, and then get the volume of space assembly by calculating the volumes of these basic geometric shapes.

When there is length and width, it implies that there is already a cardinal number, which is a real measure of the material world. Because the area involves the transformation of the real world, the area is represented by covering the physical substrate. So 2*2 = 1 * 4, although the length and width are different on the mathematical basis, they are consistent in the coverage of the physical basis.