Cut a circle with a radius of 3cm on an iron sheet with a length of 1 meter and a width of 8 decimeters. Find the utilization rate of the iron sheet?
在一张长1米、宽8分米的铁皮上剪半径3cm的圆，求这张铁皮的利用率？
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">1 * 100 * 8 * 10</gadget>
<output>8_000</output>

<gadget id="calculator">9 / 8_000</gadget>
<output>9/8_000 = around 0.001125</output>

<gadget id="calculator">3.14 * (9/8_000)</gadget>
<output>0.003533</output>

<result>0.003533</result>