A square swimming pool has a perimeter of 400 meters, what is its area in hectares
一个正方形的游泳池，周长是400米，它的面积是公顷多少
<gadget id="calculator">400 / 4</gadget>
<output>100</output>

<gadget id="calculator">400 / 4 / 10_000</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">100 * (1/100)</gadget>
<output>1</output>

<result>1</result>