The diameter of a five-inch cake is about 12.7 cm. The conversion relationship between cake inch and centimeter is: 1 (inch) inch =2.54CM, so a 5-inch cake is 12.7cm.

How to compare the sizes of cakes?

When we compare cakes of different sizes, we need to consider the size or area of the cake. A 6-inch cake is larger in size or area than two 5-inch cakes.

This is because when we put two 5-inch cakes together, some of them will overlap, so their total volume or area will not simply add up. A 6-inch cake can completely occupy a space without overlapping parts.

Therefore, although the diameters of two 5-inch cakes add up to 10 inch, their total volume or area is not equal to that of one 10 inch cake. On the contrary, the volume or area of a 6-inch cake is larger than the total volume or area of two 5-inch cakes.