Use two identical squares to form a rectangle, and the perimeter of this rectangle is 19.2 centimeters. Find the side length of the square. (column equation solution)
用两个完企相同的正方形拼成一个长方形，这个长方形的周长是19.2厘来．求正方形的边长．(列方程解答)
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">19.2 / 6</gadget>
<output>3.2</output>

<result>3.2</result>