A 50.35-meter-long iron wire is stretched 10 times in parallel on a cylindrical pillar, and there is still 3.25 meters of iron wire left. What is the diameter of this cylindrical pillar?
用一根长50.35米的铁丝，在一个圆柱形柱子上平行地饶了10圈，铁丝还剩下3.25，米，这个圆柱形柱子的直径是多少？
<gadget id="calculator">50.35 - 3.25</gadget>
<output>47.1</output>

<gadget id="calculator">47.1 / 10 / 3.14</gadget>
<output>1.5</output>

<result>1.5</result>