Use wire to form a rectangle with a length of 50 cm and a width of 100 cm. If it is straightened and then surrounded to form a square, what is the area of the square?
用铁丝围成一个长方形，长是50厘米，宽是100厘米，如果拉直后再围成一个正方形，这个正方形的面积是多少？
<gadget id="calculator">50 + 100</gadget>
<output>150</output>

<gadget id="calculator">150 * 2</gadget>
<output>300</output>

<gadget id="calculator">300 / 4</gadget>
<output>75</output>

<gadget id="calculator">75 * 75</gadget>
<output>5_625</output>

<result>5_625</result>