There is an approximately triangular piece of land with a height of 40 meters and a base three times the height. How many square meters is this triangular piece of land?
有一块近似三角形的地，高40米，底是高的3倍，这块三角形地有多少平方米？
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">40 * 3 * 20</gadget>
<output>2_400</output>

<result>2_400</result>