From a rectangle with a length of 19 cm and a width of 13 cm, cut out the largest square, what is the area of the remaining part in square centimeters?
从一个长19厘米，宽13厘米的长方形中，剪一个最大的正方形，剩下部分的面积是多少平方厘米？
<gadget id="calculator">19 - 13</gadget>
<output>6</output>

<gadget id="calculator">13 * 6</gadget>
<output>78</output>

<result>78</result>