Cut a cylinder and assemble it into a cuboid with the same base and height. The surface area of this cuboid is 20 cm2 larger than that of the cylinder. If the circumference of the base of the cylinder is 12.56 cm, what is the volume of the cylinder in cubic centimeters?
把一个圆柱体切开，拼成一个与它等底等高的长方体，这个长方体的表面积比圆柱体多20平方厘米，若圆柱的底面周长是12.56厘米，圆柱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">20 / 2 / 2</gadget>
<output>5</output>

<gadget id="calculator">3.14 * 4 * 5</gadget>
<output>62.8</output>

<result>62.8</result>