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TV monitors are typically measured diagonally in inches or centimeters. The unit of measurement depends on the manufacturer and the region where the TV is sold. It is not common to measure TV monitors in meters.
Measure it - or read the product specification.
Time
21 inches is the diagonal measure of the screen in a 21-inch TV.
You measure the screen by going diagonal across the screen. Some screens are up to one inch smaller than their advertised size.