8-inch photo:15.2cm * 20.3cm. The inch is 6*8, which is about half of A4 printing paper.

The size of the photo is in inches, 1 inch =2.54cm, and usually x inches refers to the inch length of the long side of the photo.

8-inch screen: The diagonal length of the screen is 8 inches. If it is a 16: 9 screen, it is 6.97 inches long and 3.92 inches wide. If it is a 4: 3 screen, it is 6.40 inches long and 4.80 inches wide.

8-inch cake: 8 inches =20.32cm≈2 kg, suitable for 4-6 people.