This may be a little late for most (and if it is, you're on top of things- good job) but check this out (from howstuffworks.com):
"Aspect Ratio and Viewable Area
Two measures describe the size of your display: the aspect ratio and the screen size. Historically, computer displays, like most televisions, have had an aspect ratio of 4:3. This means that the ratio of the width of the display screen to the height is 4 to 3.
For widescreen LCD monitors, the aspect ratio is 16:9 (or sometimes 16:10 or 15:9). Widescreen LCD displays are useful for viewing DVD movies in widescreen format, playing games and displaying multiple windows side by side. High definition television (HDTV) also uses a widescreen aspect ratio."
So, just to clarify, the aspect ratio is not the measurement of the diagonal in relation to the height of the screen, but rather the width in relation to the height.
"Aspect Ratio and Viewable Area
Two measures describe the size of your display: the aspect ratio and the screen size. Historically, computer displays, like most televisions, have had an aspect ratio of 4:3. This means that the ratio of the width of the display screen to the height is 4 to 3.
For widescreen LCD monitors, the aspect ratio is 16:9 (or sometimes 16:10 or 15:9). Widescreen LCD displays are useful for viewing DVD movies in widescreen format, playing games and displaying multiple windows side by side. High definition television (HDTV) also uses a widescreen aspect ratio."
So, just to clarify, the aspect ratio is not the measurement of the diagonal in relation to the height of the screen, but rather the width in relation to the height.
keyword - "ratio"
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