Generally 9" . In some countries the preferable size is 8" as well.
7 inches
A show plate should be at least 10 inches no less . It should be the size of a normal dinner plate.
10 x 10 = 100 inches square divide that by 4 and you get 4 pieces which are 25 inches square each. and each one would be 5 by 5 or 2.5 by 10
The standard size of the plates for serving a cake are as follows; plate for serving small to medium size of cake or desert is 30cm wide, 33 centimeters diameter for larger size of cake.
In Canada, the smallest license plate size is a motorcycle plate, measuring approximately 152 mm by 102 mm (6 inches by 4 inches).
A cake plate is another name for a cakestand - a place where cakes can be stood.
It varies greatly. Some are small, some are larger. Typically, most are about 9 inches by 13 inches, and 2 inches deep. Any variation within 2 or 3 inches of this is considered about "average".
Plate
The available cake sizes for purchase are typically small (6 inches), medium (8 inches), and large (10 inches).
990g
The minimum screen size of the display is 30-40 inches.
About the size of a dinner plate.