The circumference of the base of the cylinder is 12.56 cm, the height is 30 cm, what is the volume?
圆柱的底面周长为12.56cm，高是30cm，体积是多少？
<gadget id="calculator">12.56 / 3.14 / 2</gadget>
<output>2</output>

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

<gadget id="calculator">3.14 * 4 * 30</gadget>
<output>376.8</output>

<result>376.8</result>