Inch is an English unit of length, and 1 inch is equal to 2.54 cm, which is often used to measure the screen size and photo size of electronic products. So 8 inches is about 8×2.54=20.32 cm long, and the width needs to be calculated according to the specific proportion. Generally speaking, the ratio of 8 inches is 4: 3, that is, the length-width ratio is 4:3. Therefore, the width of 8 inches is 3/4 of its length, that is, 20.32×3/4= 15.24 cm.

Length is a measure of one-dimensional space and the distance from point to point.