How do I do this problem ?

Calculus
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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.

Dec 2nd, 2014

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

Dec 2nd, 2014

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Dec 2nd, 2014
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