Given that the lateral area of a cylinder is 62.8 cm2 and the radius of the base is 2.5 cm, find the volume of the cylinder.
已知圆柱体的侧面积是62.8平方厘米，底面半径2.5厘米，求这个圆柱体的体积．
<gadget id="calculator">2.5 ** 2</gadget>
<output>6.25</output>

<gadget id="calculator">2 * 3.14 * 2.5</gadget>
<output>15.7</output>

<gadget id="calculator">62.8 / 15.7</gadget>
<output>4</output>

<gadget id="calculator">3.14 * 6.25 * 4</gadget>
<output>78.5</output>

<result>78.5</result>