triangular vegetable field has a base of 80m and a height of 35m. If 2.8kg of rapeseed is harvested per square meter, how many kilograms of rapeseed can be harvested in this field?
一块三角形的菜地，底是80m，高是35m．如果每平方米收油菜籽2.8kg，这块地可收油菜籽多少千克？
<gadget id="calculator">35 / 2</gadget>
<output>35/2 = around 17.5</output>

<gadget id="calculator">80 * (35/2) * 2.8</gadget>
<output>3_920</output>

<result>3_920</result>