If a log with a base diameter of 2 decimeters and a length of 2 meters is to be sawn into a square log with the largest cross section, how much wood needs to be sawed?
一根底面直径是2分米、长是2米的圆木，要锯成横截面是最大的正方形的方木，需要锯下多少木料？
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">3.14 * 1 * 20</gadget>
<output>62.8</output>

<gadget id="calculator">2 * 1 * 20</gadget>
<output>40</output>

<gadget id="calculator">62.8 - 40</gadget>
<output>22.8</output>

<result>22.8</result>