In the decoration market, there used to be a square floor tile with a side length of 30 cm. Now a new batch of large floor tiles has been introduced, and the side length is twice that of the small floor tile. What is the area of the large floor tiles?
装饰市场原来有一种正方形地板砖，边长是30厘米，现新进一批大块地板砖，边长是小块地板砖的2倍．大块地板砖的面积是多少？
<gadget id="calculator">30 * 2</gadget>
<output>60</output>

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

<result>3_600</result>