The size of the screen is measured by the ________.

• A. Diagonal distance between the upper right and lower left corners of the screen
• B. Horizontal width of the screen
• C. Vertical height of the screen
• D. Pixel density of the screen

Answer: (A)

Screen size is measured diagonally. This means you take the straight-line distance from one corner of the display to the opposite corner, and that single diagonal measurement is used as the standard size. The diagonal reflects the overall viewing area in a way that works across different shapes and aspect ratios, so you can compare displays with a single number. Horizontal width and vertical height describe the actual dimensions but aren’t the usual way sizes are labeled for consumer screens. Pixel density is a separate metric (how many pixels per inch) and doesn’t tell you the overall size.