The circumference of a cylinder is 18.84 decimeters and its height is 2 decimeters. What is its volume?
一个圆柱体底面周长是18.84分米，高为2分米，它的体积是多少．
<gadget id="calculator">18.84 / 3.14 / 2</gadget>
<output>3</output>

<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9 * 2</gadget>
<output>56.52</output>

<result>56.52</result>