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Viewing angle is the angle between you and the width of the screen. Because we can't talk in absolute screen size,because people sit different distances away, viewing angle, or viewing ratios take these changes into account. In temr of screen door visibility, someone with a 5 foot wide screen, sitting 10 feet away, is at 2x screen width, and will see the same SDE as someone sitting 20 feet away from a 10foot wide screen.
It's most convenient to talk in terms of the ratio of sitting distance to screen width.
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