Find the length of the arc on a circle of radius r intercepted by a central angle of theta. (round your answer to two decimal places.) Radius r is 4 meters Central Angle Theta is 120 degrees.
First, change the unit of the central angle from degree into rad
120 degree= 120/180 pi=2/3pi rad
So the length of the arc = r * angle(rad) = 4 *2/3pi=8/3 * 3.14= 8.37 m
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