my computer screen is 20 inch 
how to measure the 20 inch   ? (using ruler 1 , 2 or 3 )





So How to measure it ?

1. Take a measuring tape or ruler.

2. Hold the tape from top left corner to bottom right corner or from top right corner to bottom left (measure the screen only not the border of the monitor or LCD screen ).

 


The Result = 12 Inch

Note : 1 inch = 2.54 cm