for a 7-inch screen, the diagonal length is 7 inches, that is, 17.78cm For a normal screen, it is 14.2cm*1.67cm.

1 inch (in)=2.54 cm, and 7 inches equals 17.78 cm.

1mil=1/1inch=.254cm=.254mm。

1inch=1mil=2.54cm=25.4mm。

in the British system, 12 inches (_) is one foot (_) and 36 inches is one yard.

1 inch =16mm (digital sensor).

Extended information:

Source of inch:

inch, which means thumb in Dutch, and its length is equivalent to the length of a thumb. Similarly, people's thumbs are different in length. In the 14th century, the British emperor Edward II issued a decree stipulating the length of 1 inch. It is not the average length of the thumb, but the length of the three longest grains in a row from a handful of barley ears as the length of 1 inch. ?

In the English unit of length, the definition of "code" is more specific, which was set by the British emperor Henry I. One day about 9 years ago, Henry I was sitting on the throne. He stretched out his arm and cocked his thumb and said to the ministers, "See, the maximum distance from the tip of my nose to my thumb is the basic length unit."

Since then, code has been used as a unit of length in some English-speaking countries such as Britain and America. We convert the following, one yard is equal to .9144 meters. ?

Reference: Baidu Encyclopedia-Inch