A square and a rectangle have the same perimeter. The length of the rectangle is 35 meters and the width is 25 meters. What is the area of the square in square meters?
一个正方形和一个长方形的周长相等，长方形的长是35米，宽是25米．正方形的面积是多少平方米？
<gadget id="calculator">35 + 25</gadget>
<output>60</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">60 * (1/2)</gadget>
<output>30</output>

<gadget id="calculator">30 * 30</gadget>
<output>900</output>

<result>900</result>