If the side of a cylinder is unfolded, the length of the unfolded rectangle is 12.56 cm and the width is 3 cm. What is the volume of this cylinder in cubic centimeters?
一个圆柱的侧面展开，量得展开后的长方形的长是12.56厘米，宽是3厘米，这个圆柱体的体积是多少立方厘米．
<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 * 3</gadget>
<output>37.68</output>

<result>37.68</result>