The length of an arc is 12.5 cm, and the circumference of the circle where it is located is 200 cm. Find the degree of the central angle subtended by the arc.
一段圆弧长12.5厘米，它所在的圆周长是200厘米，求弧所对的圆心角的度数．
<gadget id="calculator">180 * 12.5</gadget>
<output>2_250</output>

<gadget id="calculator">200 / 3.14 / 2</gadget>
<output>31.847134</output>

<gadget id="calculator">3.14 * 31.847134</gadget>
<output>100.000001</output>

<gadget id="calculator">2_250 / 100.000001</gadget>
<output>22.5</output>

<result>22.5</result>