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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.
4.189/3 = 1.3963 radians = roughly 80 degrees(rounded)
3*280 = 840
About 93.3 x 3 = 280
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