If a square iron sheet with a side length of 6 decimeters is processed into a circular iron sheet as large as possible, what is the utilization rate of this iron sheet?
把一块边长是6分米的正方形铁皮，加工成一块尽可能大的圆形铁皮，这块铁皮的利用率是多少？
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9</gadget>
<output>28.26</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">28.26 / 36</gadget>
<output>0.785</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">0.785 * 1</gadget>
<output>0.785</output>

<result>0.785</result>