"Length" is often used as a geometric concept, also called length, to describe the degree of lateral extension of an object or the extension of time. The original meaning of "wide" is that the house is wide and big, and later it refers to a vast area. The word "width" also refers to the horizontal distance of an object from its original meaning. "Height" In mathematical geometry, it is often necessary to measure the height of a figure.
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"Long" can be expressed by letters as capital L, which is the first letter of the length; "width" can be expressed in letters as capital w, which is the first letter of width; "Height" can be represented by capital H, which is the first letter of height.
In plan view, the length, width and height of an object can be represented by three views. The front view can show the length and height, the top view shows the length and width, and the left or right view shows the width and height.
The length l (capital l) is the first letter of the length. Width b (capital b) is the first letter of width. Height h (capital h) is the first letter of height. Depth d (capital d) is the first letter of depth.
Volume, also called capacity, is the size of the space occupied by an object, and the international system of units for volume is cubic meters.
The volume of a solid object is a numerical value that describes the space occupied by the object in three-dimensional space. One-dimensional space objects (such as straight lines) and two-dimensional space objects (such as squares) have zero volumes in three-dimensional space.
Cuboid: V=abh (cuboid volume = length× width× height).
Cube: v = a.3 (cube volume = side length × side length × side length).
Cylindrical (perfect circle): v = π r 2h Cylindrical (perfect circle) volume = pi × (bottom radius× bottom radius )× height.
Cone (perfect circle): v = (1 /3) π r 2h Cone (perfect circle) volume = pi × bottom radius× bottom radius× height /3.