How big is an 8-inch cake?

8-inch cake, about 20 cm in diameter.

At first, cakes were all round, and cakes in cake shops were all inches. The "inch" of the cake refers to inches, so the daily 8-inch cake refers to a circle with a diameter of 8 inches.

The conversion relationship between cake inch (_) and centimeter is: 1 (inch) inch = =2.54CM. So the standard size of an 8-inch cake is 8 * 2.54cm = 20.32cm ..