A cylinder has a base diameter of 8 cm and a height of 12 cm. By cutting along a diameter perpendicular to the base, by how many square centimeters does the surface area increase?
一个圆柱的底面直径是8厘米，高是12厘米．沿着一条直径垂直于底面切下去，表面积增加了多少平方厘米？
<gadget id="calculator">8 * 12 * 2</gadget>
<output>192</output>

<result>192</result>