What is the volume of a cylinder whose bottom surface is 2 decimeters in diameter and whose sides are square?
一个圆柱体的底面直径是2分米，侧面展开是正方形，这个圆柱体的体积是多少．
<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>