The height of a cylinder is 4 decimeters. Two square sections can be obtained by cutting along the diameter of the bottom surface. What is the volume of this cylinder?
一个圆柱的高是4分米，沿着底面直径剖开可得到两个正方形的剖面，这个圆柱的体积是多少．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 4</gadget>
<output>50.24</output>

<result>50.24</result>