To know the length and width, you must also know the aspect ratio of the screen. If it is a 16:9 screen, the length and width can be roughly calculated as 3 1.70×23.77(cm) by using the triangle pythagorean theorem.
15.6 inch laptop is about 30cm*23cm in length and width.
Extended data
Specific algorithm of notebook computer screen size
Computer screen size refers to the diagonal length. The diagonal length of the 15.6 inch screen is about 37 cm, and the side length of the screen (16: 9 widescreen screen) is about 30 cm x23 cm. For a computer with a 15.6-inch screen, the width of the display screen is 4/5 of the diagonal, such as 4: 10 or 16.54 cm, but now most mainstream notebook screens are 16, and 15 inch is about 38 cm.
As for the length and width, it needs to be calculated according to the proportion of the screen. 15 inch screen means that the diagonal length of the screen is 15 inch, which can be calculated according to Pythagorean theorem. According to the specifications of the notebook, 15.6 inch (accurately called 15.6_) should refer to the diagonal length of the notebook screen, and the unit is _. 15.6 inch equals 39.624 cm.
15.6 inch notebook computer has a screen size of 387mm*259mm, which is a relatively standard size.