The radius of the circle where an arc is located is 1. If the central angle of this arc is increased by 36°, how much is the arc length of this arc increased?
一条弧所在圆的半径为1，若将这条弧的圆心角增加36°，那么这条弧的弧长增加多少．
<gadget id="calculator">36 / 360</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">3.14 * 1 * 2 * (1/10)</gadget>
<output>0.628</output>

<result>0.628</result>