The length of a rectangle is 4 cm and the width is 2 cm. Its perimeter is equal to the perimeter of a square. What is the area of the square in square centimeters?
一个长方形的长是4厘米，宽是2厘米，它的周长与一个正方形的周长相等，这个正方形的面积是多少平方厘米
<gadget id="calculator">4 + 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>