A gradian translates into 1/400 of a full circle. It is also known as a grade or a grad. The gradian originated in France, with the introduction of the metric system, along with measurements like the centigrade.
0° = 0 grade 90° = 100 grade 180° = 200 grade 270° = 300 grade 360° = 400 grade
One advantage of this, as shown above, is that it makes for extremely easy mental computation of right angles and other common angle measures, and is useful in engineering and architecture.
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