The label paper of a cylindrical can can be cut into a square. The height of the label paper is 18.84cm. What is the area of this label paper?
一个圆柱形罐头盒的商标纸，剪开后是正方形，商标纸高18.84cm，求这张商标纸的面积是多少？
<gadget id="calculator">18.84 * 18.84</gadget>
<output>354.9456</output>

<result>354.9456</result>