How big is an 8-inch plate? What are the reference materials?

The board is 8 inches, which is 20.32cm when converted into centimeters, and the area is 324. 13 square centimeters. The reference object has a smaller basin. The specific reference object is as shown in the figure:

Calculation process:

Radius = 4x2.54 =10.16cm.

Area = 3.14x10.16x10.16 = 324.13cm2.

"Inch" is a traditional unit of length in China, which is expressed in decimal system by "ruler" and "ruler" (10 inch = 1 ruler,1ruler = 1 ruler). In Korea, it is used to indicate the number of relatives, for example, 1 inch indicates the relationship between two generations. By analogy, Hong Kong laws follow the ancient system, 1 inch =3.33 cm.

In Hong Kong, however, almost no one uses this unit, only "inch" (1 inch =2.54 cm) and "cm" will be used; "inch" usually means "inch"

Universal size conversion:

1 inch =2.54 cm.

1 inch (city inch) = 0.0333 m.

1cm = 1cm。

1 inch = 0.02531392m.

1 foot = 10 inch, 1 inch = 10 minute.

1 ft = 15.8, 1 inch = 1.58.