What do the following have most in common: degrees of angles; planets are divided into orbits; painting into geometrical lines; double entry bookkeeping and musical notations:

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All these examples involve the use of numbers, measuring, and the use of sight in their respective contexts. Degrees of angles involve measuring angles and using numbers to quantify them. Planets are divided into orbits, which involves measuring distances and using numbers to describe their paths. Painting into geometrical lines involves the use of sight to interpret shapes and often involves measuring and numerical ratios to create those shapes. Double entry bookkeeping uses numbers to track financial transactions. Musical notations involve the use of sight to read the notes and often include numerical values for timing, thus involving measuring and the use of numbers.

What Do the Following Have Most in Common: Degrees of Angles;