Master Wang has a piece of iron sheet with a length of 5dm and a width of 3dm. Now he wants to cut off the largest circle from this piece of iron sheet to make the bottom of the bucket.
王师傅有一块长5dm，宽3dm的铁皮，现在他要从这块铁皮上剪去一个最大的圆做桶底，剪去后，这块铁皮还剩多少dm**2？
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) ** 2</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">3.14 * (9/4)</gadget>
<output>7.065</output>

<gadget id="calculator">15 - 7.065</gadget>
<output>7.935</output>

<result>7.935</result>