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They developed the first mathematical system of painting perspective
A long narrow mark or band
One example of monophonic music from the middle ages is the Gregorian Chant! It's a central tradition of Western plainchant, and was used by the Roman Catholic Church.
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An interval scale is one where there is order and the difference between two values is meaningful. Examples of interval variables include: temperature (Farenheit), temperature (Celcius), pH, SAT score (200-800), credit score (300-850).
