In a circle with a radius of 6cm, the length of the arc subtended by a central angle is 6.28cm, what is the central angle?
半径为6cm的圆，一圆心角所对的弧长为6.28cm，这个圆心角多少度？
<gadget id="calculator">180 * 6.28</gadget>
<output>1_130.4</output>

<gadget id="calculator">3.14 * 6</gadget>
<output>18.84</output>

<gadget id="calculator">1_130.4 / 18.84</gadget>
<output>60</output>

<result>60</result>