A rectangle has the same perimeter as a square. The length of the rectangle is 124 decimeters and the width is 56 decimeters. What is the area of the square in square decimeters?
一个长方形与一个正方形的周长相等，长方形的长是124分米，宽是56分米，正方形的面积是多少平方分米．
<gadget id="calculator">124 + 56</gadget>
<output>180</output>

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

<gadget id="calculator">180 * (1/2)</gadget>
<output>90</output>

<gadget id="calculator">90 * 90</gadget>
<output>8_100</output>

<result>8_100</result>