If the cake is round and about10.2 cm in diameter, two or three people can eat it. An 8-inch cake is 20 cm long and suitable for 4 to 6 people.
The size of a 4-inch photo is about 2.67 "* 4", which means that the ratio of printed photos is about 3: 2. We usually refer to the size of the long side, but it is worth noting that there are almost no 4-inch photos now, and now they are usually 5 inches.
Precautions:
The standard size of a 4-inch photo is 10 cm * 7.6 cm. Generally speaking, when we say 4 inches, we mean the length of the long side of the photo, that is, the photo length is10.16 cm.
The photo size is usually 1 inch, 2 inches, 5 inches, 6 inches, 7 inches, 8 inches, 10 inch, 12 inch, etc. A 4-inch photo is not easy to see. Now, photos taken with mobile phones can be developed in a photo studio. As long as they are not too big, they are generally below 6 inches, including 6-inch photos, which can produce satisfactory results. If the photos of mobile phones are not very clear, the results of development will be discounted.