What is the utilization rate of a cube with a side length of 20 cm into the largest cylinder?
将一个棱长20厘米的正方体石料加工成一个最大的圆柱，石料利用率是多少．
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 100 * 20</gadget>
<output>6_280</output>

<gadget id="calculator">20 * 20 * 20</gadget>
<output>8_000</output>

<gadget id="calculator">6_280 / 8_000</gadget>
<output>157/200 = around 0.785</output>

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

<gadget id="calculator">(157/200) * 1</gadget>
<output>157/200 = around 0.785</output>

<result>157/200 = around 0.785</result>