Define a radian measure.

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Text solutionVerified

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:

1 rad = \frac{18 0 ^{\circ}}{π}

Degree	$3 0^{o}$	$4 5^{o}$	$6 0^{o}$	$9 0^{o}$	$18 0^{o}$	$27 0^{o}$	$36 0^{o}$
Radian	$\frac{π}{6}$	$\frac{π}{4}$	$\frac{π}{3}$	$\frac{π}{2}$	$π$	$\frac{3 π}{2}$	$2 π$

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