GENERAL KNOWLEDGE

Detailed explanation-1: -Angle subtended at the centre by an arc of length 1 unit in a unit circle (circle of radius 1 unit) is said to have a measure of 1 radian. The symbol used to denote the radian measure is “rad” or “c”.

Detailed explanation-2: -Radian is used to measure smaller angles. When written in radian the angle of the circle will be 2 radian. So, the conversion factor from radian to degree is 180/.

Detailed explanation-3: -Answer: Radians are often used instead of degrees when measuring angles. In degrees a complete revolution of a circle is 360◦, however in radians it is 2. If an arc of a circle is drawn such that the radius is the same length as the arc, the angle created is 1 Radian (as shown below).