Скачать или смотреть What is Radian? | Radian (Unit of Plane Angle) |Simply Explained| SAJAG JAIN SIR (In just 3 minutes)

Radian describes the plane angle subtended by a circular arc as the length of the arc divided by the radius of the arc. One radian is the angle subtended at the center of a circle by an arc that is equal in length to the radius of the circle. The magnitude in radians of such a subtended angle is equal to the ratio of the arc length to the radius of the circle; that is, θ = l / r, where θ is the subtended angle in radians, l is arc length, and r is radius. Conversely, the length of the enclosed arc is equal to the radius multiplied by the magnitude of the angle in radians; that is, l = rθ.
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