A cylinder has a base diameter of 4 meters and a height of 6 meters. If the cylinder is cut in half along the diameter of the base, how many square meters will the surface area increase?
一圆柱底面直径是4米，高是6米，沿着底面直径把圆柱切成两半，表面积增加了多少平方米？
<gadget id="calculator">4 * 6 * 2</gadget>
<output>48</output>

<result>48</result>