Given that the diameter of the base of the cylinder is 8 decimeters and the height is 3 decimeters, find the volume of the cylinder.
已知圆柱的底面直径是8分米，高为3分米，求圆柱的体积．
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">3.14 * 16 * 3</gadget>
<output>150.72</output>

<result>150.72</result>