What is Radian?

and Radian is a measurement unit defined as 180/° ° or about 57.2958 °. Sometimes shortened as advice or as an index c , which is worth "circular measurement", Radian is a standard unit of measurement of angles in mathematics. Radian was first conceived by English mathematician Roger Cotes in 1714, although he did not name the measuring unit. The word Radian first appeared in the press in 1873. Because the meters are canceled in the radian definition, the radian is considered to be dimensionless, and for this reason the radians are often simply written as a number, without a unit symbol.

Radian is an angle formed by two -meters, lines from the center to the outer perimeter of the circle, where the created arch equals the radius. The angle in the radians can be calculated by dividing the length of the arch that cuts the angle with the radius of the circle (S/R). There are 360 ​​° in each circle, straight 2π radians. Another angle measurement system, grad, divides the circle into 400 grades. Grad 200/π is equal to the radial.

In mathematics, the radians are preferred to other angle measurement units, such as grades and grades, because of their nature or their ability to produce elegant and simple results, especially in trigonometry. In addition, as well as all units, the Radians are generally used, so they allow mathematicians and scientists to easily understand the calculations of the other without transmission problems.

Another unit derived from the Radian is The Steradian (SR) or a square radian that measures firm angles. The fixed angle can be visualized as a conical part of the ball. Širradian is another dimensionless measurement unit, equal to m Steride can be calculated by distributing an area covered on the ball surface with a square radius (S/R

2 ).