Angle, Gon

The grad, also called grade, gradian, or gon, uses k = 400/2π, making the angle of a full circle 400 grads, and a right angle 100 grads. It is a decimal subunit of the right angle. A kilometer was historically defined as a centi-gon of arc along a great circle of the Earth, so the kilometer is the decimal analog to the sexagesimal nautical mile. The gon is used mostly in triangulation, and represents the percentage rise or grade of a slope (such as a hill, roof, path, or road). Read more

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An angle is the figure formed by two rays sharing a common endpoint, called the vertex of the angle. Angles provide a means of expressing the difference in slope between two rays meeting at a vertex without the need to explicitly define the slopes of the two rays. Angles are studied in geometry and trigonometry. Read more

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Angle, Gon

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