The diameter of the base is 6 cm and the height is 5 cm. Calculate the volume of the cylinder.
底面直径是6厘米，高是5厘米，计算圆柱体的体积．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">3.14 * 3 * 3 * 5</gadget>
<output>141.3</output>

<result>141.3</result>