There is a triangular green space at the corner of the school playground, with a base of 12 meters and a height of 8 meters, which requires 0.5 kg of fertilizer per square meter. How many kilograms of fertilizer is needed in total?
学校操场角上有一块三角形绿地，底边12米，高8米，每平方米需要0.5千克化肥．一共需要化肥多少千克？
<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">12 * 4 * 0.5</gadget>
<output>24</output>

<result>24</result>