A cylindrical iron rod has a base radius of 2 cm and a length of 100 cm, what is its volume in cubic centimeters?
一根圆柱形铁棒，底面半径是2厘米，长是100厘米，它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 * 100</gadget>
<output>1_256</output>

<result>1_256</result>