The base radius of a cylinder is 3 cm and the height is 4 cm. What is the volume of this cylinder?
圆柱的底面半径是3厘米，高4厘米，求这个圆柱的体积？
<gadget id="calculator">3 ** 2</gadget>
<output>9</output>

<gadget id="calculator">3.14 * 9 * 4</gadget>
<output>113.04</output>

<result>113.04</result>