A triangular wheat field has a base of 140 meters and a height of 60 meters. How many square meters does this wheat field occupy?
一块三角形的麦田，底是140米，高为60米，这块麦田的占地面积的多少平方米？
<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">140 * 30</gadget>
<output>4_200</output>

<result>4_200</result>