What is the area of a square paddy field with a side length of 200 meters?
一块边长是200米的正方形稻田，面积是多少公顷？
<gadget id="calculator">200 * 200</gadget>
<output>40_000</output>

<gadget id="calculator">40_000 / 10_000</gadget>
<output>4</output>

<result>4</result>