The perimeter of a square-shaped piece of paper is 20 cm shorter than the height of a computer screen. How many cm is the height of the screen if the side of the square paper is 20 cm?
How many cm is the perimeter of the square paper? ** The perimeter of a square is found by 4*side, which means the square paper has a perimeter of 4*20 = <<4*20=80>>80
How many cm is the height of the computer screen? ** Since the perimeter of the square is 20 cm shorter than the height of the computer screen, the height of the computer screen is 20+80 = <<20+80=100>>100cm.
#### 100