If a log with a diameter of 20 cm and a length of 2 meters is sawed into a square log with the largest square cross-section, how much wood needs to be sawed?
一个直径是20厘米，长2米的圆木，要锯成横断面是最大的正方形的方木，需要锯下多少木料？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

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

<gadget id="calculator">3.14 * 100 * 200</gadget>
<output>62_800</output>

<gadget id="calculator">2 * 100 * 200</gadget>
<output>40_000</output>

<gadget id="calculator">62_800 - 40_000</gadget>
<output>22_800</output>

<gadget id="calculator">22_800 / 1_000</gadget>
<output>114/5 = around 22.8</output>

<result>114/5 = around 22.8</result>