Expanding the side of a cylinder is exactly a square with a side length of 12.56 cm, what is the volume of this cylinder π
将一个圆柱的侧面展开正好是一个边长为12.56厘米的正方形，这个圆柱的体积多少π
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">4 * 12.56</gadget>
<output>50.24</output>

<result>50.24</result>