The size of the plate refers to the length of the diameter, and the radius = half of the diameter.

If it is inches, then 8 inches =8x2.54=20.32cm, and the radius =10.16cm; If it is a city inch, then 8 inches =8x3.33=26.64cm, and the radius = 13.32.

Area formula: area = (radius * radius) *3. 14.

The area of 8-inch board =10.16 *10.16 * 3.13.32 *13.32 * 3.

Extended data

Classification of plates:

Divide by material

1, plastic PP, PE and other materials;

2. Ceramic plates are mainly household ceramics;

3, metal plate stainless steel, aluminum, tin, tinplate, etc. ;

4. Wooden plates are mainly used for cooking.

Divide by purpose

1, household: small plates, candy plates, fruit plates, etc. Is commonly used;

2, service industry: plates can also be used as kitchen utensils, especially those boiled fish, hot pot need metal and ceramic plates, fruit plates and so on.