cylindrical steel cross-section has a radius of 5 cm and a length of 150 cm. What is the volume of this bar in cubic decimeters?
一根圆柱形的钢材横截面的半径是5厘米，长是150厘米．这根钢材的体积是多少立方分米？
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">150 / 1_000</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">3.14 * 25 * (3/20)</gadget>
<output>11.775</output>

<result>11.775</result>