Grads to Radians conversion
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The grad is a unit of plane angle that is equivalent to 1⁄400 of a circle. It is also known as gon or grade (not to be confused with gradient or radian unit). One grad equals 9⁄10 of a degree or π⁄200 of a radian.
Radian is the standard unit of angular measure that defines the ratio between the length of arc and its radius. Radian is a former SI supplementary unit, but since 1995 when this category was abolished it is considered a SI derived unit.