A triangular piece of land has a base of 400 meters and a height of 250 meters. What is the area of the land in hectares?
一块三角形地，底是400米，高250米，这块地的面积是多少公顷．
<gadget id="calculator">250 / 2</gadget>
<output>125</output>

<gadget id="calculator">400 * 125</gadget>
<output>50_000</output>

<gadget id="calculator">50_000 / 10_000</gadget>
<output>5</output>

<result>5</result>