After a cylinder is cut along the diameter of its upper and lower bottom surfaces, the surface area increases by 24cm**2, and the cut surface is a square. Find the surface area of this cylinder. (π takes 3)
一个圆柱体，沿它的上下底面直径剖开后，表面积增加了24cm**2，且剖开面为正方形．求这个圆柱体的表面积．(π取3)
<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<result>54</result>