The circumference of a circular tabletop is 3.768m. Please design a square tablecloth, the edge of the tablecloth should hang at least 30cm below the tabletop. What is the side length of this tablecloth?
一个圆形桌面的周长是3.768m．请你设计一块正方形桌布，桌布的边至少要垂到桌面下30cm．这块桌布的边长是多少？
<gadget id="calculator">3.768 / 3.14</gadget>
<output>1.2</output>

<gadget id="calculator">0.3 * 2</gadget>
<output>0.6</output>

<gadget id="calculator">1.2 + 0.6</gadget>
<output>1.8</output>

<result>1.8</result>