A triangular vegetable field has a base of 6 meters and a height twice that of the base. What is the area in square meters?
一块三角形的菜地，它的底是6米，高是底的2倍，面积是多少平方米．
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<result>36</result>