Pi is an irrational number..........so u cannot do it by numbers......but geometrically u could......with a graphing computer..................man oh man..................

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Make sure you don't mix up arc length with the measure of an arc which is the degree size of its central angle. A circle is 360° all the way around; therefore, if you divide an arc'sdegree measure by 360°, you find the fraction of the circle's circumference that the arc makes up.

How to Determine the Length of an Arc - dummies

www.dummies.com/education/math/geometry/how-to-determine-the-length-of-an-arc-2/

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How to Determine the Length of an Arc - dummies

www.dummies.com/education/math/.../how-to-determine-the-length-of-an-arc-2/

Make sure you don't mix up arc length with the measure of an arc which is the degree size of its central angle. A circle is 360° all the way around; therefore, if you divide an arc's degree measure by 360°, you find the fraction of the circle's circumference that the arc makes up.

Arc length from subtended angle: radians (video) | Khan Academy

▶ 2:38

https://www.khanacademy.org/...arc-length.../arc-length-from-angle...

In other words ......If the measure of the angle had been 1 radian, then the arc length would equal 5 - "units ...

Arc Length and Radian Measure - Regents Exam Prep Center

www.regentsprep.org/regents/math/algtrig/atm1/arclengthlesson.htm