A rectangle surrounded by a wire is 18 cm long and 10 cm wide. If it is reshaped into a square equal to its perimeter, what is the area of the square?
一根铁丝围成的长方形长18厘米，宽10厘米，如果改围成一个与它周长相等的正方形，这个正方形的面积是多少？
<gadget id="calculator">18 + 10</gadget>
<output>28</output>

<gadget id="calculator">28 * 2</gadget>
<output>56</output>

<gadget id="calculator">56 / 4</gadget>
<output>14</output>

<gadget id="calculator">14 * 14</gadget>
<output>196</output>

<result>196</result>