A square is formed by unfolding the sides of a cylinder. Given that the height of the cylinder is 12.56dm, find the volume of the cylinder.
把一个圆柱侧面展开后是一个正方形．已知圆柱的高是12.56dm，求圆柱的体积．
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4 * 12.56</gadget>
<output>157.7536</output>

<result>157.7536</result>