The perimeter of the two squares differs by 16 cm, and the area differs by 56 cm**2. What is the area of the larger square?
两个正方形的周长相差16cm，面积相差56cm**2，那么大正方形的面积是多少？
<gadget id="calculator">72 / 8</gadget>
<output>9</output>

<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<result>81</result>