There are two cylinders A and B with the same base area. The height of cylinder A is 6.28 centimeters, and its side is a square. The height of cylinder B is 4 centimeters. What is its volume in cubic centimeters?
有甲、乙两个底面积相等的圆柱，甲圆柱高6.28厘米，侧面展开是正方形，乙圆柱高4厘米，它的体积是多少立方厘米．
<gadget id="calculator">2 * 3.14</gadget>
<output>6.28</output>

<gadget id="calculator">6.28 / 6.28</gadget>
<output>1</output>

<gadget id="calculator">1 ** 2</gadget>
<output>1</output>

<gadget id="calculator">3.14 * 1 * 4</gadget>
<output>12.56</output>

<result>12.56</result>