If a piece of iron wire is bent into a circle, a circle with a radius of 10cm can be obtained. If it is bent into an arc with a central angle of 90°, what is the radius of the circle where this arc is located?
一根铁丝，若把它弯成圆形，可得一个半径为10cm的圆，如果将其弯成圆心角为90°的一条弧，那么这条弧所在圆的半径是多少厘米．
<gadget id="calculator">3.14 * 10 * 2</gadget>
<output>62.8</output>

<gadget id="calculator">180 * 62.8</gadget>
<output>11_304</output>

<gadget id="calculator">90 * 3.14</gadget>
<output>282.6</output>

<gadget id="calculator">11_304 / 282.6</gadget>
<output>40</output>

<result>40</result>