A triangular vegetable field has a base length of 20 meters and a height of 18 meters. What is the area in square meters?
一块三角形菜地，底长20米，高18米，这块的面积是多少平方米？
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">20 * 9</gadget>
<output>180</output>

<result>180</result>