It is known that the length of an arc is 34.54cm, and the central angle it subtends is 72°, so what is the radius of the circle it is in?
已知一条弧的长度为34.54cm，它所对的圆心角为72°，那么它所在的圆的半径是多少？
<gadget id="calculator">180 * 34.54</gadget>
<output>6_217.2</output>

<gadget id="calculator">72 * 3.14</gadget>
<output>226.08</output>

<gadget id="calculator">6_217.2 / 226.08</gadget>
<output>27.5</output>

<result>27.5</result>