Given that the radius of the arc is 50 cm and the central angle is 60°, find the length of the arc. (keep π)
知圆弧的半径为50厘米，圆心角为60°，求此圆弧的长度．(保留π)
<gadget id="calculator">50 / 3</gadget>
<output>50/3 = around 16.666667</output>

<result>50/3 = around 16.666667</result>