The side area of a cylinder is 18.84 square centimeters, and the radius of the base is 4 centimeters. Find its volume.
一个圆柱侧面积是18.84平方厘米，底面半径是4厘米，求它的体积．
<gadget id="calculator">4 ** 2</gadget>
<output>16</output>

<gadget id="calculator">2 * 3.14 * 4</gadget>
<output>25.12</output>

<gadget id="calculator">18.84 / 25.12</gadget>
<output>0.75</output>

<gadget id="calculator">3.14 * 16 * 0.75</gadget>
<output>37.68</output>

<result>37.68</result>