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1) ANGLE: The union of two non collinear rays which has common end point is called an angle.
2) RADIAN: Angle subtended at the centre of a circle by an arc of length equal to the radius of the circle is called angle of one radian.
3) A circle contains Radians
4) A circle contains Degrees
5)  Radians Degrees
6)  Degree  Minutes
7)  Minute  Second 
8)  Radian
9)  Radian
10)
11) If  is the angle (measured in radians) subtended at the centre of a circle of radius  by an arc of length  , then  .
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