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Define a radian measure.

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Define a radian measure.

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Angle subtended at the centre by an arc of length 1 unit in a unit circle is said to have a measure of 1 radian. 

Keen eye:

1rad = 180°/π = 57°16'.

Degree 30° 45° 60° 90° 180° 270° 360°
Radian π/6 π/4 π/3 π/2 π 3π/2 2π

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