What is the volume of a cone whose base radius and height are both 3 cm?
一个圆锥的底面半径和高都是3厘米，它的体积是多少立方厘米．
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3.14 * 9 * 3 * (1/3)</gadget>
<output>28.26</output>

<result>28.26</result>