The height of a cylinder is 40 cm, cut along the diameter of the bottom surface, the section obtained is a square, what is the volume of this cylinder in cubic decimeters?
一个圆柱的高是40厘米，沿底面直径剖开，得到的剖面是正方形，这个圆柱的体积是多少立方分米．
<gadget id="calculator">1_256 * 40</gadget>
<output>50_240</output>

<gadget id="calculator">50_240 / 100</gadget>
<output>2_512/5 = around 502.4</output>

<result>2_512/5 = around 502.4</result>