9 inches here means 9 inches, not 9 city inches.

1 inch = 2.54cm, 9 inches = 9× 2.54cm = 22.86cm.

Extended data:

In the photo industry, a few inches of photos means that the long side of a photo is several inches, not in city inches.

The specifications of photos will be expressed in inches, which is different from the diagonal length of products such as monitors. The "several inches" in photos refers to the inch length of the long side of photos. For example, a 6-inch photo means a 6×4-inch photo. There is also a common method to express the size of a photo in the world, that is, take the integer value of the short side of the photo and add the letter R to express it. For example, a 6-inch photo has a specification of 6×4 inches, that is, 4R.

Inch (inch) is a unit of length used in the United Kingdom (UK, that is, Britain (Commonwealth) and its former colonies, generally 1in=2.54cm, in the British system, 12 inch is 1 foot, and 36 inch is 1 yard.

In building materials, pipes are called in inches, which is 2.54cm, instead of city inches.

In liquid crystal displays, the specifications are generally 17 inch, 19 inch, 22 inch and so on. In mobile phones, screen sizes are now generally 4.0 inches, 4.2 inches, 4.5 inches, 4.7 inches, 4.8 inches, 5.0 inches, 5.2 inches, 5.5 inches, 5.7 inches and 6.44 inches. In a tablet computer, the screen size is generally 7.9 inches, 9.7 inches, 12.9 inches. The size of the display screen is usually measured by the diagonal length, in inches.

Inch scores: 1/64, 3/64, 5/64, 7/64, 9/64;

Decimals of inch: 0.0 15625, 0.03 125, 0.046875;

China's customary terms are: 1.25%, 2.50% and 3.75%.

1mil= 1/ 1000inch=0.00254cm=0.0254mm；

1inch= 1000mil=2.54cm=25.4mm；

In the British system, 12 inch (inch) is 1 foot (foot), and 36 inch is 1 yard;

1 inch =25.4mm (digital sensor).

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