Cut the largest square out of a rectangle whose length is 12 cm and width is 7 cm. What is the area of this square in cm**2?
在长是12cm，宽是7cm的长方形中剪下一个最大的正方形，这个正方形的面积是多少cm**2？
<gadget id="calculator">7 * 7</gadget>
<output>49</output>

<result>49</result>