A certain square is a square, and a circle along the edge is 600 meters long. What is the area of the square in hectares?
某广场是一个正方形，沿着边缘走一圈是600米，这个广场的面积是多少公顷？
<gadget id="calculator">600 / 4</gadget>
<output>150</output>

<gadget id="calculator">150 / 10_000</gadget>
<output>3/200 = around 0.015</output>

<gadget id="calculator">150 * (3/200)</gadget>
<output>9/4 = around 2.25</output>

<result>9/4 = around 2.25</result>