define 1 radian in short answer
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Answer:
1 radian is the angle which an arc of length equal to the radius of a circle subtends at the centre of the circle.
Explanation:
The arc of a circle subtends an angle at the centre of the circle. This angle is called a plane angle. Its unit is radian.
Similarly, the area of a spherical surface subtends an angle at the centre of the sphere. This angle is called the solid angle.
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