A pillar has a base radius of 0.8 meters and a height of 3.5 meters. What is the volume of this pillar?
一根柱子的底面半径是0.8米，高是3.5米，这根柱子的体积是多少？
<gadget id="calculator">0.8 ** 2</gadget>
<output>0.64</output>

<gadget id="calculator">3.14 * 0.64 * 3.5</gadget>
<output>7.0336</output>

<result>7.0336</result>