The diameter of the base of a cylinder is 2dm, and the sides are expanded to form a square. What is the volume of the cylinder in dm**3.
一个圆柱的底面直径是2dm，侧面展开后是正方形，这个圆柱的体积是多少dm**3．
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

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

<gadget id="calculator">3.14 * 2</gadget>
<output>6.28</output>

<gadget id="calculator">3.14 * 1 * 6.28</gadget>
<output>19.7192</output>

<result>19.7192</result>