There is a lawn, and a square path with a width of 1.2 meters is paved on all four sides with square bricks with a side length of 30 cm, and a total of 1504 square bricks are used. Find the area of the lawn surrounded by the deer.
有一片草坪，四边用边长为30厘米的方砖铺了一条宽为1.2米的正方形小路，共用方砖1504块．求小鹿所围草坪的面积．
<gadget id="calculator">1_504 / 1.2 / 4</gadget>
<output>313.333333</output>

<gadget id="calculator">0.3 * 0.3 * 313.333333</gadget>
<output>28.2</output>

<gadget id="calculator">28.2 - 1.2</gadget>
<output>27</output>

<gadget id="calculator">27 * 27</gadget>
<output>729</output>

<result>729</result>