What is the volume of a conical part with a base diameter of 4 cm and a height of 4.5 cm?
一个圆锥形零件，底面直径是4cm，高4.5cm，它的体积是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

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

<gadget id="calculator">(1/3) * 3.14 * 4 * 4.5</gadget>
<output>18.84</output>

<result>18.84</result>