Gradian

In trigonometry, the gradian, also known as the gon (from Ancient Greek: γωνία, romanized: gōnía, lit. 'angle'), grad, or grade, is a unit of measurement of an angle, defined as one hundredth of the right angle; in other words, there are 100 gradians in 90 degrees. It is equivalent to 1/400 of a turn, 9/10 of a degree, or π/200 of a radian. Measuring angles in gradians is said to employ the centesimal system of angular measurement.:22 Gradians are principally used in surveying (especially in Europe), and to a lesser extent in mining and geology.

Gradian

In trigonometry, the gradian, also known as the gon (from Ancient Greek: γωνία, romanized: gōnía, lit. 'angle'), grad, or grade, is a unit of measurement of an angle, defined as one hundredth of the right angle; in other words, there are 100 gradians in 90 degrees. It is equivalent to 1/400 of a turn, 9/10 of a degree, or π/200 of a radian. Measuring angles in gradians is said to employ the centesimal system of angular measurement.:22 Gradians are principally used in surveying (especially in Europe), and to a lesser extent in mining and geology.