In more detail
1920:1080 simplifies to 16:9. Scaling keeps the ratio: a recipe in the ratio 2:3 uses 6 parts of the first for every 9 of the second.
Glossary
Math & Statistics
Ratio
A ratio compares two quantities by division, written a:b, and is usually simplified by their greatest common factor.
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See also
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Glossary
Percentage
A percentage expresses a number as a part of 100, so 25% means 25 out of every 100, or one quarter.
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Glossary
Aspect ratio
Aspect ratio is the proportion of an image or screen's width to its height, written as two numbers such as 16:9.