The surface area of a cylinder is 50.24cm**2, and the radius of the base is 2cm. What is the volume of this cylinder in cubic centimeters?
一个圆柱的表面积是50.24cm**2，底面半径是2厘米，这个圆柱的体积是多少立方厘米？
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 4 * 2</gadget>
<output>25.12</output>

<gadget id="calculator">50.24 - 25.12</gadget>
<output>25.12</output>

<gadget id="calculator">3.14 * 2 * 2</gadget>
<output>12.56</output>

<gadget id="calculator">25.12 / 12.56</gadget>
<output>2</output>

<result>25.12</result>