The answer depends on what information you do have: radius, arc length, central angle etc.
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If you have the arc length:where:L is the arc length.R is the radius of the circle of which the sector is part.
In a unit circle, the arc length ( s ) is directly equal to the angle ( \theta ) in radians. Therefore, if the arc length of a sector is 3 radians, the measure of the angle of the sector is also 3 radians.
By using a protractor and finding the angle between the two radii
sector