A triangular vegetable field has a base of 30 meters and a height of 46 meters. What is the area of this vegetable field in square meters?
一块三角形菜地，底30米，高46米，这块菜地的面积是多少平方米？
<gadget id="calculator">46 / 2</gadget>
<output>23</output>

<gadget id="calculator">30 * 23</gadget>
<output>690</output>

<result>690</result>