The area of a triangular piece of land is 0.045 hectares, its base is 30 meters, and its height is in meters.
一块三角形土地的面积是0.045公顷，它的底是30米，高是多少米．
<gadget id="calculator">0.045 * 10_000</gadget>
<output>450</output>

<gadget id="calculator">2 / 30</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">450 * (1/15)</gadget>
<output>30</output>

<result>30</result>