Cut out the largest circle on a piece of iron sheet with a length of 80 cm and a width of 62 cm. What is the radius of this circle.
在一张长80厘米，宽62厘米的铁皮上剪下一个最大的圆．这个圆的半径是多少．
<gadget id="calculator">62 / 2</gadget>
<output>31</output>

<result>31</result>