A piece of triangular land has a base of 150 meters and a height of 400 meters. What is the area of this triangular piece of land in hectares?
一块三角形土地，底是150米，高是400米，这块三角形土地的面积是多少公顷？
<gadget id="calculator">400 / 2 / 10_000</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">150 * (1/50)</gadget>
<output>3</output>

<result>3</result>