If the diameter and height of the base of a log are both 3 decimeters, what is the volume of the cylinder?
一根圆木底面的直径和高都是3分米，这个圆柱的体积是多少．
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) ** 2</gadget>
<output>9/4 = around 2.25</output>

<gadget id="calculator">3.14 * (9/4) * 3</gadget>
<output>21.195</output>

<result>21.195</result>