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| Grade measure (Centesimal system or French system) |
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| The principal unit of this system is grade(g) which is one hundreds part of right angle. |
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| one grade = 100 minutes |
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| 1 minutes = 100 seconds |
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| \ 1 right angle = 100 grades (100g) |
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| 1g = 100 minutes (100') |
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| 1' = 100 seconds (100") |
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| The attempt to introduce this grade system in France was not successful. |
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| Relation between the three systems of measuring an angle. |
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| Let D = number of degrees |
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| G = number of grades |
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| C = number of radians of an angle |
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