cylindrical steel, cut off 1 meter. The measured diameter of its cross section is 20 centimeters, and the cut volume accounts for (1/4) of the steel. How many cubic decimeters was the original volume of the steel?
一根圆柱形钢材，截下1米．量的它的横截面的直径是20厘米，截下的体积占这根钢材的(1/4)，这根钢材原来的体积是多少立方分米？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

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

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">100 / 1_000 / (1/4)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3.14 * 100 * 1 * (2/5)</gadget>
<output>125.6</output>

<result>125.6</result>