What is the area of a square whose side length is 300 meters?
边长是300米的正方形的面积是多少公顷．
<gadget id="calculator">300 * 300</gadget>
<output>90_000</output>

<gadget id="calculator">90_000 / 10_000</gadget>
<output>9</output>

<result>9</result>