If an arc with a length of 14.13 cm is cut from a circle with a radius of 10 cm, what is the central angle subtended by this arc?
从半径为10厘米的圆周上截下长为14.13厘米的弧，则此弧所对的圆心角是多少度．
<gadget id="calculator">3.14 * 2 * 10</gadget>
<output>62.8</output>

<gadget id="calculator">14.13 / 62.8</gadget>
<output>0.225</output>

<gadget id="calculator">360 * 0.225</gadget>
<output>81</output>

<result>81</result>