A rectangle and a square have the same perimeter. The length of the rectangle is 16 meters and the width is 4 meters. What is the area of the square in square meters?
一个长方形和正方形的周长相等，长方形的长是16米，宽是4米，正方形的面积是多少平方米？
<gadget id="calculator">16 + 14</gadget>
<output>30</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<gadget id="calculator">15 * 15</gadget>
<output>225</output>

<result>225</result>