The diameter of the base of a cylinder is 4 decimeters, and the lateral area of the cylinder is 62.8 square decimeters. What is the volume of this cylinder in cubic decimeters?
一个圆柱体底面直径径是4分米，圆柱侧面积是62.8平方分米．这个圆柱的体积是多少立方分米？
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">62.8 / 2 / 3.14 / 2</gadget>
<output>5</output>

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

<result>62.8</result>