After expanding the side of a cylinder with a diameter of 20 cm, a square is obtained. What is the volume of this cylinder in cubic centimeters?
将一个直径为20厘米的圆柱侧面展开后，得到一个正方形，这个圆柱的体积是多少立方厘米．
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 ** 2</gadget>
<output>100</output>

<gadget id="calculator">3.14 * 20</gadget>
<output>62.8</output>

<gadget id="calculator">3.14 * 100 * 62.8</gadget>
<output>19_719.2</output>

<result>19_719.2</result>