The base of a parallelogram is 25 meters, and its two heights are 30 meters and 20 meters respectively. What is the area of this parallelogram in hectares?
一个平行四边形的底是25米，它的两条高分别是30米、20米．这个平行四边形的面积是多少公顷．
<gadget id="calculator">25 * 30</gadget>
<output>750</output>

<gadget id="calculator">750 / 10_000</gadget>
<output>3/40 = around 0.075</output>

<result>3/40 = around 0.075</result>