The base radius of a cylinder is 2, and its side view is a square. If π is 3, what is the volume of the cylinder?
一个圆柱的底面半径是2，它的侧面展开图是正方形，如果π取3，则这个圆柱的体积是多少．
<gadget id="calculator">2 ** 2</gadget>
<output>4</output>

<gadget id="calculator">3 * 2 * 2</gadget>
<output>12</output>

<gadget id="calculator">3 * 4 * 12</gadget>
<output>144</output>

<result>144</result>