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Gradian

Unit of angle
In trigonometry, the gradian – also known as the gon, grad, or grade – is a unit of measurement of an angle, defined as one-hundredth of the right angle; in other words, 100 gradians is equal to 90 degrees. It is equivalent to 1/400 of a turn,... Wikipedia
degrees: 9/10°
radians: π/200 rad; ≈ 0.0157... rad
1 gon in: is equal to
minutes of arc: 54′
Symbol: gon, g, grad
turns: 1/400 turn
Unit of: Angle