In the square, there used to be a square flowerbed with a side length of 45 meters. After the expansion, the side length increased by 15 meters, and the area of the flowerbed increased by how many square meters.
广场上，原来有一块边长是45米的正方形花圃，扩大后的边长增加了15米，花圃的面积增加了多少平方米．
<gadget id="calculator">45 + 15</gadget>
<output>60</output>

<gadget id="calculator">60 * 60</gadget>
<output>3_600</output>

<gadget id="calculator">45 * 45</gadget>
<output>2_025</output>

<gadget id="calculator">3_600 - 2_025</gadget>
<output>1_575</output>

<result>1_575</result>